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英语
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The problem is difficult,（ ）he has worked it out.
A.however
B.yet
C.while
D.and
为什么不能用however而要用yet?具体回答!
人气：372 ℃ 时间：2020-02-04 21:23:38
解答
B
However后面要加逗号之后才接句子
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