China's reform and opening has been going on for ________ is like about 30 years now and it's really quite remarkable.

A．that B．which C．what D．it

 

C

【解析】考查名詞性從句。句意：中國的改革開放現(xiàn)在已經(jīng)進(jìn)行了大約三十年，效果非常明顯。________ is like about 30 years now是介詞for的賓語，該部分缺少主語，所以選起雙重作用的what。

 

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