问题
选择题
Xiao Ming will come and play with me if he ______ busy. [ ]
A. is
B. won't be
C. isn't
D. will be
答案
答案：C
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Xiao Ming will come and play with me if he ______ busy. [ ]
A. is
B. won't be
C. isn't
D. will be
答案：C