单项选择题

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

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

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

A. live
B. living
C. to live
D. lived
单项选择题
It’s a pity that some of the people（）cannot come to the party.

A. inviting
B. invited
C. to invite
D. were invited
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