【題目】Air pollution is ________ most Chinese people are concerned about nowadays, because their health is being threatened.

A.thatB.why

C.whatD.how

【答案】C

【解析】

考查表語從句。句意：空氣污染是現(xiàn)在大多數(shù)中國(guó)人關(guān)心的問題，因?yàn)樗麄兊慕】嫡艿酵{。此處be動(dòng)詞后面是表語從句，從句缺少引導(dǎo)詞，謂語動(dòng)詞短語are concerned about缺少賓語，所以所填詞要起雙重作用，應(yīng)填what，故選C。

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