–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
情態(tài)動詞辨析。A.能 B. 會    C. 應該 D. 必須。句意：學生們在哪兒：他們怎么能讓我們等這么久？——他們一個小時前出發(fā)，我認為他們應該在十五分鐘內(nèi)到這兒。表達自己的判斷，故選C。
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