问题补充:
You are wet through . You in the rain .
A. must come
B. must be caught
C. must have caught
D. must have got caught
答案:
A. must come
B. must be caught
C. must have caught
(答案→)D. must have got caught
解析:“must +不定式的完成式”表示对过去发生行为的肯定推测,只用于肯定句。句4中,be / get caught in a rain 为一个固定搭配。