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    【题目】—I wonder why Tom left without a word.

    —He __________ have had some trouble, for he looked dull.

    A. should

    B. must

    C. can

    D. could

    【答案】B

    【解析】考查情态动词。句意：——我想知道汤姆为什么一句话也没说就离开了？——他一定是遇到麻烦了，因为他当时看起来很郁闷。后面有原因，所以用must表示比较肯定的推测。

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