问题描述:
请问为什么用during which period
Qian Xuesen was in America from 1935 to 1955,______________the research into jet planes.(concentrate)这是一个完成句子的题目.during which period he concenteated on
Qian Xuesen was in America from 1935 to 1955,______________the research into jet planes.(concentrate)这是一个完成句子的题目.during which period he concenteated on
问题解答:
我来补答展开全文阅读