问题

The reason__________ their failure you knowis__________ they didn’t get fully prepared for the experiment.
A:as
B:that, why
C:for, that
D:why, because
B:that, why
C:for, that
D:why, because
正确答案是:
同类题型
I don’t know if Mr. Smith ______. If he _____, I will tell you.
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