问题补充：
These teams, which twenty experienced workers, are working hard here to the time they have lost before.
A. are made up of; make up of
B. are made up of; make up for
C. make up; make up for
D. make up for; make up
答案：
(答案→)A. are made up of; make up of
B. are made up of; make up for
C. make up; make up for
D. make up for; make up
解析：考查短语。be made up of 由…组成；make up化妆，编造，弥补，组成；句意：那些由20个富有经验的工人组成的队伍正在努力工作以弥补以前失去的时间。
