__________ she couldn’t understand was_________more and more students showed little interest in their lessons.
A．What; whyB．That; whatC．What; because D．Why; that
A
考查名詞性從句。What引導起主語從句what she couldn’t understand，在句中understand的賓語。Why more and more students showed little interest in their lessons是 一個表語從句。因為句子很完整，所以使用連接副詞why引導。句意：她不能理解的是為什么越來越多的學生對他們的課程沒有興趣。
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