单项选择题

John's score on the test is the highest in the class; he ______ last night.

A．must study
B．should have studied
C．must have studied
D．is sure to study
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单项选择题
It was dark in the cave so she ______ a match.
A．struck
B．hit
C．fired
D．burned
单项选择题
Apart from caring for her children, she has to take on such heavy ______ housework as carrying water and firewood.
A．time-consumed
B．timely-consumed
C．time-consuming
D．timely-consuming
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