题目内容：
第22空正确答案是（ ）
参考答案：
答案解析：
单选题：第22空正确答案是（ ）
- 题目分类：英语
- 题目类型：单选题
- 查看权限：VIP
Let's write them__________before we forget them.
Let's write them__________before we forget them.
It__________us five hours to work out the problem.
It__________us five hours to work out the problem.
He is a__________boy, so he can' t go to the park by himself
He is a__________boy, so he can' t go to the park by himself.
He traveled all over the world__________ he had a man-made l
He traveled all over the world__________ he had a man-made leg.
我国国内有效发明专利占有效专利的比重为：
我国国内有效发明专利占有效专利的比重为：