—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 done B．is doing C．must be done D．must do 

C

解析試題分析：句意：在中國(guó)中東部的霧霾似乎變得越來越嚴(yán)重了。——我也這么想。必須采取措施來解決這個(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。
考點(diǎn)：考查時(shí)態(tài)及語(yǔ)態(tài)。

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