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6．For the sake of students'health，outdoor activities ______ in some areas late last year because of the smog pollution．（　�。�
A．do not allowB．did not allow
C．were not allowedD．are not allowed

分析 為了學生的健康，因為霧霾的污染，去年一些地區(qū)不允許開展戶外活動．

解答 答案C．
根據句子中的時間狀語"last year"可知，是過去的時間狀語，動作應該發(fā)生在過去，固定短語"be allowed to do sth  被允許做某事"，因此應該用一般過去時的被動語態(tài)．故選C．

點評 本題考查時態(tài)辨析．解答此類題目首先要讀懂句意，捕捉信息，理解情境，綜合運用，靈活答題，結合具體的語境，選出正確的時態(tài)．在平時學習的過程中，對每一種時態(tài)的用法要掌握到位．

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