A.take；save
B.to take；save
C.take；to save
D.to take；to save
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A.is used to be
B.was used to be
C.used to be
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A.has left
B.had left
C.has been away
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A.in
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D.by
A.stand by
B.stand for
C.stood by
D.stood for
A.to pay attention
B.paying attention
C.pay attention
D.your paying attention
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