Is that old man _ you often help with his housework.选哪一个A./ B.as C.why D.the one

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Is that old man _ you often help with his housework.选哪一个A./ B.as C.why D.the one
Is that old man _ you often help with his housework.选哪一个
A./ B.as C.why D.the one

Is that old man _ you often help with his housework.选哪一个A./ B.as C.why D.the one
D,这是定语从句的只是,先把句子变为肯定句,只能是That old man is ______ you often .
这个句子中is缺表语(同时又是后面定语从句的先行词),后面的help缺少宾语,所以应该用the one who/that,做宾语时that'或who省略了
那个老人是不是你经常帮他做家务的?
如果句子是Is that the old man.,这样就选A(因为改为肯定就是That is the old man ...,只缺一个引导词who或that,省略