My father walked _____ in the room, looking as if he was thinking over something.
A．now and then B．up and down
C．a(chǎn)gain and againD．over and over
B
now and then表示時間；again and again和over and over表示次數(shù)。這三個短語都不符合語境。walk up and down in the room意思是“在房間里踱來踱去”。
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