◎ 题干
I am not sure _____ he will come here. ______ he comes here, please let me know.      
[     ]
A. that, When  
B. that, If      
C. if, Whether    
D. whether, When
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“I am not sure _____ he will come here. ______ he comes here, please let me know.[ ]A. that, WhenB. that, IfC. if, WhetherD. whether, When…”主要考查了你对  【宾语从句】【状语从句】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。