Mary______my letter; otherwise she would have replied before now.

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问题 Mary______my letter; otherwise she would have replied before now.

选项 A、has received
B、ought to have received
C、couldn’t have received
D、shouldn’t have received

答案C

解析 这个句子的前半部分是对过去事情的否定推测,“玛丽一定是没收到我的信”,因此要用could not have done sth.。我们知道,对现在的肯定推测用must+动词原形,否定推测用can’t+动词原形,如:It’s 7 o’clock now;he must be back from work.已经7点了,他一定下班了。It’s 7 o’clock now;he can’t be in the office.已经7点了,他不会在办公室。对过去的肯定推测用must+动词完成式,否定推测用can’t(couldn’t)+动词完成式,如:You must have made a mistake.你一定是做错了。The light is on;hecan’t(couldn’t)have gone out.灯还亮着,他一定没出去。
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