单项选择题

A.If
B.With
C.As
D.Had
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单项选择题
A.was takingB.had takenC.would takeD.would have taken
A.was taking
B.had taken
C.would take
D.would have taken
单项选择题
A.whenB.beforeC.untilD.since
A.when
B.before
C.until
D.since
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