题目内容

–Where are the students? How could they keep us waiting for so long?
–They started an hour ago and they ____ be here in fifteen minutes, I think.
A．canB．wouldC．shouldD．must
C
情态动词辨析。A.能 B. 会    C. 应该 D. 必须。句意：学生们在哪儿：他们怎么能让我们等这么久？——他们一个小时前出发，我认为他们应该在十五分钟内到这儿。表达自己的判断，故选C。
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