—Heavy smog (霧霾 )in eastern and central China seems to get more and more serious.
—I agree. Something          to deal with it.
A．has doneB．is doingC．must be doneD．must do
C

試題分析：句意：在中國(guó)中東部的霧霾似乎變得越來(lái)越嚴(yán)重了�！乙策@么想。必須采取措施來(lái)解決這個(gè)問題。結(jié)合語(yǔ)境可知下文主語(yǔ)為動(dòng)作對(duì)象，故用被動(dòng)語(yǔ)態(tài)，選C。
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