问题补充：
I could hear voices but I couldn’t what they were saying.
A. turn out
B. pick out
C. work out
D. make out
答案：
A. turn out
B. pick out
C. work out
(答案→)D. make out
解析：
试题分析:考查动词短语。A结果是，生产；B挑选；C计算出，锻炼身体；D辨认出。根据语境可知说话人听不清对方说的话，所以D选项正确。句意：我可以听到声音，但是听不清楚他们在说什么。
