单项选择题

Mr. Brown did not tell us（）or not he’ll be leaving next week.

A. whether
B. if
C. either
D. weather

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单项选择题
Since nobody is answering the phone, they（）

A. should have left
B. must have left
C. need have left
D. can have left
单项选择题
A group of youngsters sat under the big tree（）

A. chatting and laughing
B. chatted and laughed
C. was chatting and laughing
D. was chatted and laughed
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