问题补充：
He will our class to sing at the school singing contest.
A. take place of
B. stand for
C. represent
D. representative of
答案：
A. take place of
B. stand for
(答案→)C. represent
D. representative of
解析：take place of 短语不完整，take the place of意思是“代替…位置”； represent“作为…的代表”； stand for“作为…的标志、符号等”。
