问题补充：
The boy was very sick, but he managed to .
A. pull off
B. pull out
C. pull through
D. pull up
答案：
A. pull off
B. pull out
(答案→)C. pull through
D. pull up
解析：考查词组：A. pull off脱去，胜利完成B. pull out（使）离开，（火车）驶出C. pull through度过难关D. pull up（使）停下（住），句意：男孩病了，但他设法恢复。选C。
