单项选择题
21()
A.cliffs
B.dinosaurs
C.fossils
D.museums
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单项选择题
It is high time we______.
A.leave
B.left
C.will leave
D.have left
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单项选择题
He was busy yesterday; otherwise he ______to the meeting.
A.would have come
B.would come
C.could come
D.had come
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