单项选择题

Doctor Green, along with his assistants, （） on the project day and night to meet the deadline.

A. work
B. are working
C. is working

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单项选择题

The little boy （） his homework. Don’t make any noise!

A. is doing
B. was doing
C. does

单项选择题

The Greens （） China for five years.

A. has been in
B. have been in
C. has gone to

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