为什么要说成could have disarranged ? 为什么不是could disarrange ?
I have said that over the great Grimpen Mire there hung a dense, white fog. It was drifting slowly in our direction and banked itself up like a wall on that side of us, low but thick and well defined. The moon shone on it, and it looked like a great shimmering ice-field, with the heads of the distant tors as rocks borne upon its surface. Holmes's face was turned towards it, and he muttered impatiently as he watched its sluggish drift.
"It's moving towards us, Watson."
"Is that serious?"
"Very serious, indeed - the one thing upon earth which could have disarranged my plans. He can't be very long, now. It is already ten o'clock. Our success and even his life may depend upon his coming out before the fog is over the path."
The night was clear and fine above us. The stars shone cold and bright, while a half-moon bathed the whole scene in a soft, uncertain light. Before us lay the dark bulk of the house, its serrated roof and bristling chimneys hard outlined against the silver-spangled sky. Broad bars of golden light from the lower windows stretched across the orchard and the moor.
从上面的对话中，对 the one thing upon earth which could have disarranged my plans 不懂。 为什么要说成could have disarranged ? 为什么不是could disarrange ? 根据上面的对话和故事发展，这里还没有开始disarrange, 应该是“将来”才有可能disarrange 呀？如此的话，为什么用could have disarranged 这样一种对过去已发生的事情的推测呢？
最佳答案 2020-11-27 18:25
which could have disarranged my plans. 可能把我的计划给打乱了。我现在可能需要改变计划了。
说话人根据当前的情况（大雾正向自己的方向移动），推测某件事在过去可能发生了（大雾的出现可能把他的计划打乱了）。所以用could have done.
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