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