—I'll ask the teacher about the attributive clause. I'm very puzzled about it.
—That's just ________ most of our classmates have doubt.
A．whatB．whyC．whereD．how
C

試題分析：考查表語從句。句意：--我要去問老師定語從句的知識，我很不理解定語從句。--這就是大多數(shù)學(xué)生都不理解的地方。Is后跟從句作表語，即表語從句；what作主語或賓語，why表原因；where指地點；how指方式。B、C、D都作狀語。表語從句不缺少成分，不用what，這里指“不理解的地方”，用where，故選C。
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