B
However后面要加逗号之后才接句子
The problem is difficult,（ ）he has worked it out.
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!
A.however
B.yet
C.while
D.and
为什么不能用however而要用yet?具体回答!
英语人气：170 ℃时间：2020-02-04 21:23:38
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