问题补充：
The professor spoke so fast during the lecture that we couldn’t what he said.
A. turn out
B. make out
C. carry out
D. leave
答案：
A. turn out
(答案→)B. make out
C. carry out
D. leave
解析：考查动词短语：A. turn out结果是，B. make out辨认出，理解，C. carry out 实施，D. leave 离开，句意是：教授在讲座时讲的太快以至于我们不能理解他说的话。选B.
