—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問題。結(jié)合語境可知下文主語為動作對象，故用被動語態(tài)，選C。
考點：考查時態(tài)及語態(tài)。

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