The reason he gave for not ing was his mother wouldn’t allow him to.
A. why ; that
B. for which ; that
C. why ; because
D. which; that
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(答案→)A. why ; that
B. for which ; that
C. why ; because
D. which; that
解析：考查名词性从句。The reason why … is/was that ………的原因是……，why引导定语从句，that引导表语从句，选A .