Nowadays, many parents are trying to either prevent their children from failure, or protect them from the knowledge ______ they have failed.

A. when B. where C. what D. that

D

【解析】

試題分析：考查名詞性從句。that引導(dǎo)同位語從句，具體說明knowledge的內(nèi)容是they have failed。句意：如今，許多家長們正努力不讓他們的孩子遭受失敗，或是正保護(hù)孩子們，不讓他們知道他們自己已經(jīng)失敗。故D正確。

考點(diǎn)：考查名詞性從句

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