2. 外语
  3. Mary______my letter; otherwise she would have replied before now.

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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