问题
选择题
I am quite busy. I don't know _______ I will have time or not tonight.
[ ]
A. if
B. weather
C. whether
D. when
答案
答案：C
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I am quite busy. I don't know _______ I will have time or not tonight.
[ ]
A. if
B. weather
C. whether
D. when
答案：C