赞题库-背景图

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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热门试题

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