________ she couldn’t understand was ________ fewer and fewer students showed interest in her lessons.
A．What；whyB．That；whatC．What；becauseD．Why；that
A
考查名詞性從句。what she couldn’t understand是主語從句，what引導(dǎo)這個主語從句并在句中作賓語。后面是一個表語從句，句子結(jié)構(gòu)很完整所以應(yīng)該使用連接副詞，再從句意考慮，使用why。句意：她不能理解的是為什么越來越少的學(xué)生對她的課感興趣。
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