问题
How difficult math is! I really want to drop it ! —_________you come on，you will do it better．
A:at the same time
B:at one time
C:from time to time
D:at a time;
B:at one time
C:from time to time
D:at a time;
正确答案是：
同类题型
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Thank you for having us. We had a very goodtime today. —______.Bye!