单项选择题

To get a better view of the stage,（）

A. our seats had to be changed
B. our seats were changed
C. we had to change our seats
D. we had changed our seats

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单项选择题

The dog is missing. He shouldn’t have let the dog go out of the house alone. The possible meaning of the sentence is:（）

A. He is being praised for he has let the dog go out of the house alone
B. He is being asked to let the dog go out of the house alone
C. He is being complained for he has let the dog go out of the house alone
D. He is being expected to find the dog that has gone out of the house alone

单项选择题

He told me part of the story and that was （）

A. it
B. this
C. so
D. that