Why the explosion occurred was the laboratory attendant had been careless.A. for B. becau

发布时间：2020-08-16 07:39:36

Why the explosion occurred was     the laboratory attendant had been careless.
A. for
B. because
C. since
D. that

网友回答

A. for
B. because
C. since
(答案→)D. that
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