(經(jīng)典回放)The research is so designed that once ________ nothing can be done to change it．

[　　]
A．

begins

B．

having begun

C．

beginning

D．

begun

答案：D
解析：

本題考查的是在狀語(yǔ)從句中的省略。once引導(dǎo)的是一個(gè)條件狀語(yǔ)從句。當(dāng)從句主語(yǔ)與主句主語(yǔ)一致，從句中謂語(yǔ)是be或者從句中主語(yǔ)是it，謂語(yǔ)是be的時(shí)候，可以將從句中的主語(yǔ)與be一起省略。D項(xiàng)前省略了it is，所以此題應(yīng)選擇D項(xiàng)。


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