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。