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

The conclusion can be deduced from the premises.()

A. argued
B. derived
C. permitted
D. come

单项选择题

Nobody could figure out this problem.()

A. make out
B. think of
C. solve
D. discover

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