单项选择题

Your sister studies hard now, you ______ worry about her.

A. can' t
B. needn' t
C. may not
D. mustn' t
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The walls are going to ______ blue.
A. be painted
B. being painted
C. paint
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I regret not ______ able to help you.
A. be
B. being
C. to be
D. been
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