问题补充：
The reason their failure you know is they didn get fully prepared for the experiment.
A. why.., that
B. that.., why
C. for.., that
D. why.., because
答案：
A. why.., that
B. that.., why
(答案→)C. for.., that
D. why.., because
解析：此题关键是their failure为名词词组，A项why后须接句子。
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