（2014山東省實(shí)驗(yàn)中學(xué)高三第二次模擬考試）7．Perhaps it will never be known __________ he did with those materials on the incident．
A．thatB．whatC．whichD．how
B
本句中的it是形式主語，真正的主語是后面的主語從句what he did with those materials on the incident。在這個(gè)主語從句中，what既是引導(dǎo)詞也是動(dòng)詞did的賓語。固定搭配do with和what連用；deal with和how連用。句義：也許他如何處理事故中的這些材料永遠(yuǎn)都不會(huì)為人所知。Which指特定范圍之內(nèi)的某一個(gè)。That在名詞性從句中不充當(dāng)任何成分。故B正確。
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