单项选择题

I regret not ______ able to help you.

A. be
B. being
C. to be
D. been
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单项选择题
It won' t be ______ he comes back.
A. long before
B. before long
C. long after
D. long since
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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