单项选择题

It won' t be ______ he comes back.

A. long before
B. before long
C. long after
D. long since
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单项选择题
My students insist ______ more English classes.
A. on having
B. in having
C. at having
D. for having
单项选择题
______ from the top of the hill, this city is more attractive.
A. Seeing
B. See
C. Seen
D. Saw
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