问题
选择题
I'm not sure ______ he is right. ______ he is right, I will follow him. [ ]
A. when, If
B. whether, Whether
C. if, Whether
D. whether, If
答案
答案：D
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I'm not sure ______ he is right. ______ he is right, I will follow him. [ ]
A. when, If
B. whether, Whether
C. if, Whether
D. whether, If
答案：D
