问题
选择题
There is no doubt _________ the world climate has been changing in recent years.
A．that
B．what
C．if
D．whether
答案
答案：A
考查固定句型：There is no doubt that 毫无疑问做某事。句意：毫无疑问世界气候在最近几年一直在变化。故选A。
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