题目内容
用所给动词的适当形式填空
It's very difficult ________ (work) out the problem.
答案:to work
解析:
解析:
|
点拨: It's+adj.+to do...结构中to do不定式作主语。 |
练习册系列答案
相关题目
题目内容
用所给动词的适当形式填空
It's very difficult ________ (work) out the problem.
|
点拨: It's+adj.+to do...结构中to do不定式作主语。 |