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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__?( )
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.