问题
单项选择题
All the staff members of the department made concerted efforts to （）the hall for the Christmas party.
A. clean up
B. clear up
C. dress up
D. make up
答案
参考答案：A
解析：
clean up“彻底清扫”；clear up“天晴起来”；dress up“打扮起来”；make up“化妆”。从句子意思上看，只能选clean up。
