单项选择题

Christopher Reeve said since his life was saved again，he had never thought of（）．

A.giving in
B.giving up
C.giving off
D.giving back

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单项选择题

Go and（）when the train is leaving．

A.be sure
B.make sure
C.be sure of
D.be sure that

单项选择题

Our motherland didn’t always look the way it（）today.There were few tall buildings.

A.is
B.does
C.is doing
D.has been