She is not certain about __________ she has done anything wrong.A．ifB．whetherC．t_刷题宝

题干

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

A．if

B．whether

C．that

D．What

上一题下一题 0.85难度单项选择更新时间:2015-07-07 10:09:59

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