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
A great deal has been done to remedy the situation.
A.maintain
B.improve
C.assess
D.protect
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