单项选择题

One of the requirements for a fire is that the material ______ to its burning temperature.

A. be heated
B. is heated
C. would be heated
D. to heated
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单项选择题
The small mountain village was ______ by the snow for more than one month.
A. cut back
B. cut out
C. cut off
D. cut away
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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