问题补充：
Mr. Brown’s condition looks very serious and it is doubtful if he will .
A. pull back
B. pull up
C. pull through
D. pull out
答案：
A. pull back
B. pull up
(答案→)C. pull through
D. pull out
解析：考查动词短语：句意：布朗先生情况危急，不知道他能否度过危险。pull through vt. 渡过（脱离，使...脱险）pull back撤出阵地，pull up停下，pull out拔出，退出，（使）离开，（火车）驶出，选C。
