The reason _____ he could not go there was _____ his grades were too low. 
A．why ; becauseB．that; becauseC．why; thatD．that; that
C
考查名詞性從句。The reason why … is / was that …，……的原因是……。Why引導(dǎo)定語從句，先行詞reason在從句中作原因狀語，that引導(dǎo)表語從句。故選C。
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