【題目】People often have difficulty facing reality when further scientific discovery challenges _______ they have previously thought to be settled facts.

A.whatB.thatC.whoD.which

【答案】A

【解析】

考查名詞性從句。句意：當進一步的科學發(fā)現(xiàn)對他們之前認為是既定事實的東西發(fā)起挑戰(zhàn)時，人們通常很難面對現(xiàn)實。分析句子可知，空白處做challenges（挑戰(zhàn)）的賓語，且引導賓語從句，在從句中做thought（認為）的賓語，稱之為“雙重成分”，用what。故選A項。

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