He was walking ( ) along the corridor.
A: back up
B: back down
C: back and forth
D: back of
A: back up
B: back down
C: back and forth
D: back of
举一反三
- The symmetry of the human body is ( ) symmetry. A: Left and right B: Up and down C: Back and forth D: Inside and outside
- She had been at the company for years and knew all the ___. A: on and off B: up and down C: ins and outs D: back and forth
- 他在教室里来回踱步，试图确定演讲题目。 A: He came up and down of the classroom to attempt to choose a speech topic. B: He walked back and forth in the classroom, trying to choose a topic for his speech. C: He came and went back in the classroom to pick a subject of a speech.
- -- Helen, are you going to the airport to pick up Jack the day after tomorrow? -- ________ tomorrow night, I would go. A: Were he to come back B: If he was about to come back C: Had he come back D: If he would come back
- I have no idea _______. A: when he will come back B: when come back will he C: when will he come back D: will he come back when