问题
选择题
I bet Mrs Black will come to help us with the celebaration if she _____ too busy tomorrow. [ ]
A. is
B. will be
C. won't be
D. isn't
答案
答案：D
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I bet Mrs Black will come to help us with the celebaration if she _____ too busy tomorrow. [ ]
A. is
B. will be
C. won't be
D. isn't
答案：D