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Are you sure__?( )

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Are you sure__?( )
A.whether she is honest B.that she is honesty
C.shi is honest D.is she honest
请说说为什么选C,
Are you sure that she is honest
整个句子应该是这样.
但是B中的honesty 是名词,而修饰性的名词不能放在be动词后面.而B错在从句中顺序应变为正常语序.
另外,从句中通常会省略that,所以选C.
至于A,是因为主句以be动词提问,所以从句连词不能用whether.
Ask him whether he knows her.
问他是否认识她.
He asked whether he could help.
他问是否他能帮忙.