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

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热门试题

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

单项选择题

What does the man mean（）

A. He thinks the gallery is not worth visiting.
B. He is tired of visiting the gallery.
C. He has been to the gallery a hundred times.
D. He has been looking forward to visiting the gallery.