问题补充：
The reason he was driving his car so fast was he would be late.
A. because, that
B. why, because
C. for which, that
D. that, that
答案：
A. because, that
B. why, because
(答案→)C. for which, that
D. that, that
解析：考查从句。定语从句for which/why he was driving his car so fast修饰先行词the reason;第二空是一个固定句型：The reason is that…原因是…；句意：他开车如此之快的原因是他本会迟到的。
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