【題目】—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】考查情態(tài)動(dòng)詞。句意：——我想知道湯姆為什么一句話也沒(méi)說(shuō)就離開(kāi)了？——他一定是遇到麻煩了，因?yàn)樗?dāng)時(shí)看起來(lái)很郁悶。后面有原因，所以用must表示比較肯定的推測(cè)。

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