单项选择题

Many scientists have been probing psychological problems.

A. solving
B. exploring
C. settling
D. handling
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单项选择题
He is determined to consolidate his power.
A. strengthen
B. control
C. abandon
D. exercise
单项选择题
John is collaborating with Mary in writing an article.
A. cooperating
B. competing
C. combining
D. arguing
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