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【题目】I am sure _____he will come here tomorrow. But I doubt ____he will help you or not.

A.that; ifB.that; whetherC.if; thatD.if; whether

【答案】B

【解析】

句意:我确定他明天会来,但是我怀疑他是否会帮你。
考查宾语从句。第一个空,I am sure 后面为 that 引导形容词性宾语从句,固定搭配,排除CD项。第二个空,I doubt 后面用 if 或者 whether 引导宾语从句均可,但 if 不能和 or not 连用,排除A项。故选:B

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