单项选择题

（）I was talking to Barbara, I learned that Tony was in hospital.

A. Unless
B. While
C. Since
D. Once

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This light bulb doesn't work. Can you （）it by another one

A. substitute
B. replace
C. change
D. exchange
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It is recommended that the project（）until all the preparations have been made.

A. is not started
B. will not be started
C. not be started
D. is not to be started
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