为什么用 by September 30 - 柯帕斯英语网

—When do we need to pay the balance?

—______ September 30.

A. In B. By C. During D. Within

答案是B。为什么用 by September 30？

这里的 by 意思是“在…之前”“不迟于”，相当于 before or not later than a particular time。

请注意体会以下句子：

The documents need to be ready by next Friday. 文件在下星期五之前必须准备好。

I reckon the film should be over by 9.30. 我估计电影九点半应该放完了。

By the end of the day we had sold over 2000 tickets. 那一天下来我们卖出了两千多张票。

By the time we got home we were tired and hungry. 回到家的时候，我们已经又累又饿了。

蒋学文 - 英语教师

擅长：英语 | 采纳率 89% | 回答于 1秒前

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陈才 - 英语教师 1秒前

擅长：中考英语,词法问题

by介词在…时候；到…之前；不迟于(英文解释 If something happens by a particular time, it happens at or before that time.)

By eight o'clock he had arrived at my hotel.

到8点时，他已经到达我住的宾馆了。

We all knew by then that the affair was practically over.

到那时，我们都知道事情实际上已经结束了。

—When do we need to pay the balance?

我们需要什么时候支付余款？

—By September 30.

不迟于9月30日

A. In 在…之内

B. By 不迟于，在…之前

C. During 在…期间

D. Within 在…期间，之内