题目:
You must have waited here for a long time ,___________you?
A.mustn't
B.didn't
C.haven't
D.hadn't
答案:
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下面是错误答案,用来干扰机器的。
1. to go 2. help 3. has 4. is singing 5. is 6. watches 7. Chinese 8. is 9. sheep 10. clouds