That tree looked as if it______for a long time.

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问题 That tree looked as if it______for a long time.

选项 A、hasn’t watered
B、didn’t water
C、hadn’t been watered
D、wasn’t watered

答案C

解析 主语“那棵树”和谓语“浇水”之间是被动关系,因此从句应该用被动语态,可据此排除选项A和B。再看时态,从句的动作明显发生在主句动作之前,主句是过去时,从句应该用过去完成时,又可排除选项D。
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