单项选择题

My students insist ______ more English classes.

A. on having
B. in having
C. at having
D. for having
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单项选择题
______ from the top of the hill, this city is more attractive.
A. Seeing
B. See
C. Seen
D. Saw
单项选择题
It must have rained last night, ______ it
A. mustn' t
B. can' t
C. didn' t
D. needn' t
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