31.There is no simple answer,_____ is often the case in science.A.as B.that C.when D.where

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31.There is no simple answer,_____ is often the case in science.A.as B.that C.when D.where

此处as引导定语从句指代整个主句内容,含有“正如”之意,定语从句部分译为“在科学上这是常有的事”.
as is often the case常被看做一个固定短语,还有as was expected等.同时,as常是放在句首的