I have to finish my homework first cleaning up the room. A. because ofB. instead ofC. in f

问题补充：

I have to finish my homework first cleaning up the room.

A. because of

B. instead of

C. in front of

D. at the end of

答案：

A. because of

(答案→)B. instead of

C. in front of

D. at the end of

解析：

句意：我必须先完成作业，而不是打扫教室。because of：由于，instead of：而不是，in front of：在---前面， at the end of：在---结束时结合语境可知应该选D。