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(yán)重的空氣污染.
解答 答案:B.
首先根據(jù)語境推測句意是"必須采取必要的措施防止嚴(yán)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(gòu)成是:主語+情態(tài)動詞+be+動詞的過去分詞. 故答案為:B
點(diǎn)評 首先根據(jù)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(gòu)成是:主語+情態(tài)動詞+be+動詞的過去分詞.
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