单项选择题

In a second-hand bookshop, Billy came across a book which he thought was certainly a ()edition.

A. rare
B. scarce
C. seldom
D. hardly

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单项选择题

I’ve worked here since I ()Harvard Business School.

A. leave
B. left
C. have left
D. had left

单项选择题

There aren’t many wild pandas ()in the world today.

A. live
B. living
C. to live
D. lived

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