【题目】There is no doubt _____ humans should protect the environment.
A. that B. which C. what D. why
在线课程【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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