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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单项选择题
These are their motives for doing it.
A．reasons
B．excuses
C．answers
D．plans
单项选择题
Many scientists have been probing psychological problems.
A．solving
B．exploring
C．settling
D．handling
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