_The work is easy for an expert it is difficult for an inexperienced person.A. becauseB. t

发布时间：2020-08-17 14:41:45

_The work is easy for an expert     it is difficult for an inexperienced person.
A. because
B. therefore
C. while
D. unless

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A. because
B. therefore
(答案→)C. while
D. unless
解析：考查连词。连词while在这里表示两种状况的对比。
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