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

【答案】A
【解析】句意：沒(méi)有簡(jiǎn)單的答案在科學(xué)上這是常有的事。此處as引導(dǎo)定語(yǔ)從句指代整個(gè)主句內(nèi)容，含有“正如”之意，定語(yǔ)從句部分譯為“在科學(xué)上這是常有的事”。故選A。

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