题目内容：

She is waiting for the doctor ______ I know will not come.A.whom B.who C.Which D.that

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答案：B
分析：1.此句为定语从句,先行词为doctor,表示人,所以首先淘汰C,C指代物.
2.分析定语从句成分：I know 可以理解为插入语,先行词在从句中充当主语,
谓语是will not come.淘汰A,A只能做宾语.
3.定语从句中有插入语时,且先行词为人时只能用who.淘汰D