The problem is difficult ________.3Q
问题描述：
The problem is difficult ________.3Q
A.to be done B.to be worked out C.to work out D.to doing
答
答案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． 查看原帖>>