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The workers are trying to ________ what’s wrong with the machine.
A．look forB．care forC．find outD．take out
C

試題分析：句意:工人們正在努力地查明機器出了什么毛病。look for 尋找；care for 關心；find out 查明，發(fā)現；take out 拿出。根據句意可知，工人們正在查明機器的毛病。故選C。
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