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题目内容
（四川民族学院大学英语A卷）
Since all the airline tickets were sold out, we were obliged to stay in the city for two more days.
A、were constrained to
B、had to
C、were grateful to
D、were persuaded to
A、were constrained to
B、had to
C、were grateful to
D、were persuaded to
参考答案
