题目内容

He has a good knowledge of electricity, ________ helps him a lot in his work．

A.
that
B.
who
C.
when
D.
which

D
解析：
该题考查定语从句中关系词的选用。此题没有先行词，整个主句“He has a good knowledge of electricity”是先行项，当整个主句作为先行项时，关系代词通常使用which，引导一个非限制性定语从句，which指的是整个主句。

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1..

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