单项选择题

Don’t all stand up at one time! ______, please.

A. Each at one time
B. One by one time
C. One at a time
D. One for each time

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单项选择题

I saw Bob play the piano at John’s party and on that （）he was simply brilliant.

A. scene
B. circumstance
C. occasion
D. situation

单项选择题

— Henry has been teaching English in Beijing University for many years. — It’s no （）he can speak Chinese so well and idiomatically.

A. matter
B. doubt
C. problem
D. wonder

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