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I’m sure ____ you can help me. But I sti...

I’m sure ____ you can help me. But I still doubt ______ I can solve all these problems or not.

A. if, whether    B. that, if    C. whether, if    D. that, whether

 

D 【解析】句意:我相信你能帮我。但我仍然怀疑我是否能解决所有这些问题。考查宾语从句的引导词。第一个空,I’m sure后面的宾语从句为陈述句,而且不缺少任何成分,所以用连接词that引导,that是从属连词不充当任何成分,排除A、C选项;第二个空doubt后面用if或whether引导宾语从句,但if不能和or not连用,排除B选项;故答案选D。  
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