这里的 come true 最好不要改用 become true，因为这样用的 come true 是习语（属固定搭配）。如：

May all your wishes come true. 祝你所有心愿都成真。

The prediction seems to have come true. 预言似乎成真了。

I’ll make all your dreams come true. 我会使你的梦想都成为现实。

My fondest dreams have at last come true. 我最期望的理想最终实现了。

Our wishes will come true one of these days. 我们的愿望有一天会实现。

I’d always dreamt of owning my own house, but I never thought it would come true. 我以前一直梦想拥有属于自己的房子，但从没想到这会成为现实。

另外，a dream come true 也是习语，也用come，不用become：

Marriage to her is a dream come true. 结婚对她来说是梦想成真了。

Winning all that money was a dream come true. 赢得了那些钱，梦想终于实现了。

After all the problems I’d had getting pregnant, Oliver’s birth was a dream come true. 经历了怀孕的所有问题后，奥利弗的出世圆了我的梦。

My dream has come true. 

句中的 come true 改为 become true 可以吗？

回答如下：

不可以用become true替换，come true 首先为固定搭配，而且，come +形容词通常表示一个好的结果。become +adj.好的坏的结果都可以

(1)come true 实现，成真; 应验;

You can make that dream come true.  

你可以让那个梦想实现。

Her wish to be a doctor has come true out of hand.  

她想做一个医生的愿望终于实现了.

His wish to visit China has at last come true.  

他要访华的愿望终于实现了.

His wish to study music has come true at last.  

他学习音乐的愿望这回算实现了.

His dream of being a doctor has come true.  

他当医生的愿望实现了.

 Our wish for better times has come true.  

我们要过好日子的愿望已实现.

 I'm afraid his hope won't come true easily.  

他的希望怕很难实现.

 A dream has come true.  

梦想变成了现实.

 The ideal is about to come true.  

理想即将实现.

 His prophecy has now come true.  

他的预言果然应验了.

 The prophecy has unfortunately come true.  

不幸言中.

(2)become +adj. 变成；成为；变得

I first became interested in Islam while I was doing my nursing training.

我在接受护理培训的时候开始对伊斯兰教产生了兴趣。

The cocoa industry dwindled because it became increasingly difficult to cover costs.

由于越来越难以收回成本，可可产业日渐衰落。

He plays some passages so slowly that they become lugubrious.  

有些段落他演奏得异常徐缓，听上去有些忧伤。

I denied my father because I wanted to become someone else.  

我和父亲断绝了关系，因为我想成为一个不一样的自己。

Many of the leaders have become hooked on power and money.  

很多领导人都变得贪恋权力和金钱。

All too often they become enmeshed in deadening routines.  

他们时常陷入枯燥的日常事务之中。

International investors have become jittery about the country's economy.  

国际投资者已对该国的经济状况感到紧张不安。

 If untreated, the gums recede, become swollen and bleed.  

如果不进行治疗，牙龈会开始萎缩、红肿和出血。

 She noticed her own proud walk had become a shuffle.  

她意识到自己趾高气扬的步伐已变成了拖着脚走路了。

 Rock'n'roll has become so commercialised and safe since punk.  

摇滚乐自从朋克乐以后就已经过于商业化而缺乏新意了。

 Later he was to become famous as a pacifist.  

后来他就变成了一位知名的和平主义者