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15．Something necessary to prevent the serious air pollution．（　　）

A．

must do

B．

must be done

C．

may do

D．

may be done

分析必須采取必要的措施防止嚴重的空氣污染．

解答答案：B．
首先根據語境推測句意是"必須采取必要的措施防止嚴重的空氣污染．"，主語 Something necessary是動作do 的承受者，確定用被動語態(tài)，由句意判斷用情態(tài)動詞must，說明本題考查含有情態(tài)動詞的被動語態(tài)，其構成是：主語+情態(tài)動詞+be+動詞的過去分詞．故答案為：B

點評首先根據所給信息明確句意，從句意判斷本題考查含有情態(tài)動詞的被動語態(tài)，其構成是：主語+情態(tài)動詞+be+動詞的過去分詞．

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56．A．arrived at	B．remained	C．got	D．entered
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