单项选择题

The problem is believed ______ at the meeting two days ago.

A. to have discussed
B. to have been discussed
C. being discussed
D. having been discussed
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单项选择题
The international situation has been growing ______ difficult for the last few years.
A. invariably
B. presumably
C. increasingly
D. dominantly
单项选择题
I'm sure your suggestion will ______ the problem.
A. contribute to solving
B. be contributed to solve
C. contribute to solve
D. be contributed to solving
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