单项选择题
The boy______ now for the light in his room is still on.
A．must study
B．must be studying
C．must have studied
D．would study
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单项选择题
By the time you get back, great changes______ in this area.
A．will take place
B．will be taken place
C．are going to take place
D．will have taken place
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单项选择题
All games______ because of the rainstorm, many students could do nothing but study in the classroom.
A．were canceled
B．having been canceled
C．had been canceled
D．have been canceled
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