Children under the age of twelve are not permitted to watch this program _______guided by their parents.

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问题 Children under the age of twelve are not permitted to watch this program _______guided by their parents.

选项 A、but
B、otherwise
C、without
D、unless

答案D

解析 空格后面的guided是过去分词。如果填入but,句子意思不通。otherwise是副词,不能连接句子;without是介词,也不能填;unless p.p.(如果不……)是经常使用的一个表现形式。
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