单项选择题

Hard as he worked, ____ he couldn't satisfy his boss.（　　

A.or
B.but
C.therefore
D./
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单项选择题
Hardly ____ the station when the train started．（ ）
A.hadIreached
B.didIreached
C.Ihadreached
D.Ididreach
单项选择题
Well, we don't have any change. So we just use card ____.（
A.either
B.incharge
C.insteadof
D.instead
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