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20.You never know how much difficulty we had _______the problem.Luckily,we managed to solve it with Mrs Wu's help.( 。
A.working outB.work outC.worked outD.to work out

分析 你不知道解答出那道題我們有多大的困難,幸運的是,在胡老師的幫助下,我們最終解答出來了.

解答 答案:A.
本題考查非謂語動詞的用法.根據語境推測句意是"你不知道解答出那道題我們有多大的困難,幸運的是,在胡老師的幫助下,我們最終解答出來了.",由設空處前面的how much difficulty we had  判斷此題考查句式"have(no) trouble/difficulty doing 做某事有(沒有)困難"; 所以選A.

點評 本題考查非謂語動詞的用法,抓住句中的關鍵詞并聯(lián)系相關的語法知識可得出正確的答案.平時注意對此類短語或句式用法的總結與歸納.

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