2. 外语
  3. Which of the following sentences expresses "probability"?

Which of the following sentences expresses "probability"?

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问题 Which of the following sentences expresses "probability"?
选项 A、He must have picked up a cold—he’s begun to snuffle.
B、We must have a clear understanding of the problem.
C、One must have one’s own opinions and not drift with the current.
D、To be healthy one must have an adequate diet.
答案A
解析 情态动词题。情态动词must除了用来表示命令，必须如何以外，还可表示有依据的肯定推测，意为“一定会……”，对现在情况的推测用“must+动词原形”；对已经发生的情况的推测则用“must have done”。[B]、[C]、[D]中的must have都表示“必须要有……”；[A]意为：他开始鼻塞，一定是感冒了。因此，[A]为答案。
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