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【题目】There is no doubt _____ humans should protect the environment.

A. that B. which C. what D. why

【答案】A

【解析】

试题分析: 考查固定句型; 句意:毫无疑问人类应该保护环境。There is no doubt that 毫无疑问,故选A项。

考点 : 考查固定句型

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