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