单项选择题

I don't know ______ I can come or not.

A. whether
B. if
C. that
D. what
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单项选择题
By the time you get there tomorrow,they ______ for Beijing.
A. will have left
B. are leaving
C. will leave
D. are to leave
单项选择题
He was praised for _____ a great contribution to his country.
A. making
B. having made
C. have made
D. make
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