There is no simple answer,______ is often the case in science.

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问题 There is no simple answer,______ is often the case in science.

选项 A、that
B、when
C、as
D、what

答案C

解析 考查定语从句。as引导定语从句,指代整个主句内容。有“正如”之意。定语从句部分意为“在科学上,这是常有的事”。故选C。
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