问题补充:
Jack almost fell off the cliff, but managed to until help came.
A. keep on
B. catch on
C. count on
D. hang on
答案:
A. keep on
B. catch on
C. count on
(答案→)D. hang on
解析:本题译文:杰克差点从悬崖上掉下来,但得以抓住不放直到得救。hang on(=hold fast, keep hold)牢牢抓住,抓紧不放:Help! I can hang on much longer.(救命啊!我支持不住啦。)keep on(doing sth.)继续(做......);catch on 理解;count on 指望,依赖。