题目内容
—Was it because of his laziness_______ he didn't do the experiment successfully?
—No, it was because of his carelessness.
A. that B. while
C. for D. as
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题目内容
—Was it because of his laziness_______ he didn't do the experiment successfully?
—No, it was because of his carelessness.
A. that B. while
C. for D. as