国家开放大学 / 综合英语（3）
正确率：100%
Charlie _ _ _ _ _ _ _ his trip to London because he couldn’t get a passport in time.
A.have canceled
B.has to cancel
C.must cancel
D.had to cancel
A.have canceled
B.has to cancel
C.must cancel
D.had to cancel
参考答案：
佳题速递：