单项选择题

While watching television, ______.

A．the doorbell rang
B．the doorbell rings
C．we heard the doorbell ring
D．we heard the doorbell rings

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单项选择题

Please remain ______ until the plane has come to a complete stop.

A．to seat
B．to be seated
C．seating
D．seated

单项选择题

______ by his grandparents, Jimmy wasn't used to living with his parents.

A．To bring up
B．To be brought up
C．Brought up
D．Being brought up

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