问题
选择题
The workers are trying to ________ what’s wrong with the machine.
A．look for
B．care for
C．find out
D．take out
答案
答案：C
题目分析：句意:工人们正在努力地查明机器出了什么毛病。look for 寻找；care for 关心；find out 查明，发现；take out 拿出。根据句意可知，工人们正在查明机器的毛病。故选C。