问题
选择题
I don't know _____ Susan will come tomorrow. _____ she comes, I'll tell you.[ ]
A. if; whether
B. whether; whether
C. whether; If
答案
答案：C
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I don't know _____ Susan will come tomorrow. _____ she comes, I'll tell you.[ ]
A. if; whether
B. whether; whether
C. whether; If
答案：C