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．mightB．wouldC．shouldD．must
C
should在这里表示预期，“应该会，可能”。can表示有能力做或能够发生；would表示想象中的结果；must表推测，或表必须。
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