My father walked in the room, looking as if he was thinking over something.A.now

My father walked _____ in the room, looking as if he was thinking over something.

A.now and then

B.up and down

C.again and again

D.over and over

试题答案

B

now and then表示时间；again and again和over and over表示次数。这三个短语都不符合语境。walk up and down in the room意思是“在房间里踱来踱去”。