A.has left
B.had left
C.has been away
D.had been away
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A.in
B.to
C.from
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
A.operated
B.made
C.run
D.done
A.which
B.what
C.that
D.whose
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