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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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
She said she（）many good friends since she came to this city.

A. has made
B. makes
C. had made
D. made
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