单项选择题

I'm sure your suggestion will ______ the problem.

A. contribute to solve
B. be contributed to solve
C. be contributed to solving
D. contribute to solving
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单项选择题
Difficult ______ the task was, they managed to accomplish it in time.
A. that
B. although
C. so
D. much
单项选择题
She ______ from scolding her child until the company left.
A. refrained
B. restrained
C. controlled
D. confined
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