There is no doubt ____ the world climate...

There is no doubt ____ the world climate _____ in recent years because of humans activities.

A. that; changed B. whether; has changed

C. that; has been changing D. what; is changing

C 【解析】试题分析：考查固定句型和动词的时态，句意：毫无疑问因为人类的活动最近这些年世界的气候一直在发生改变。There is no doubt that 。。毫无疑问。。，根据 in recent years和语境可知用现在完成进行时，故选C项。考点 : 考查固定句型和动词的时态

考点分析：

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