The work is easy for an expert it is difficult for an inexperienced person.A．becauseB．thereforeC．whileD．unless 题目和参考答案——青夏教育精英家教网——

题目内容

_The work is easy for an expert _______it is difficult for an inexperienced person.

A．because	B．therefore
C．while	D．unless

C

考查连词。连词while在这里表示两种状况的对比。

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