问题
选择题
--- 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．might
B．would
C．should
D．must
答案
答案：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。