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【题目】She is not certain about __________ she has done anything wrong.

A. if B. whether C. that D. What

【答案】B

【解析】

试题分析:考查关系词。句意:她对自己是否做了些错事感到不确定。根据前面的not certain可知是不确定的态度,有选择性。在从句中,在介词后,只能用whether,故选B项。

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