The problem is difficult ________.
A.to be doneB.to be worked outC.to work outD.to doing在线课程C
不定式短语在句中作状语，修饰表语形容词，不定式与主语构成逻辑上的动宾关系，动词不定式不用被动式．
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The problem is difficult .A.to be doneB.to be worked outC.to work outD.to doing
编辑：chaxungu时间：2026-04-24 13:01:45分类：高中英语题库
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