________my dear teacher couldn’t understand was ________ fewer and fewer middle school students showed interest in her lessons.
A．What; why　B．That; what C．What; becauseD．Why; that
A
本題考查名詞性從句。was前為主語(yǔ)從句，從句動(dòng)詞understand缺少賓語(yǔ)，故用what；was后為表語(yǔ)從句，why在從句中作原因狀語(yǔ)。故選A。
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