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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 allow		B．	did not allow
	C．	were not allowed		D．	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．故選C．

點評本題考查時態辨析．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．在平時學習的過程中，對每一種時態的用法要掌握到位．

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