单项选择题
I’m sure your suggestion will ______ the problem.
A. contribute to solving
B. contribute to solve
C. be contributed to solving
D. be contributed to solve
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单项选择题
The mother didn’t know who ______ for the broken vase.
A. blames
B. blamed
C. to blame
D. will blame
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单项选择题
Did you notice him ______
A. crossed the road
B. across the road
C. having crossed the road
D. cross the road
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