How did your brother make such a stupid mistake ______ he had a such a good knowledge of the steps and cautions over operating the machine.[ ] A.when B.becaus-高中英语-n多题

◎ 题干

How did your brother make such a stupid mistake ______ he had a such a good knowledge of the
steps and cautions over operating the machine.

[ ]

A.  when
B.  because
C.  while
D.  that

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◎ 解析

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◎ 知识点

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