题目

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：D 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't 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。

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