题目

1.you have no idea how busy we were these days为什么how 前不加that
1.all the machines had finished by the end of the following week为什么要用had finished不能用finishes吗,怎么看2.2.since the earth is round ,why do we not fall off的since为什么不能换成as 3.Bbelong有进行时态,有加ing吗

提问时间：2020-10-13

答案

1.you have no idea how busy we were these days为什么how 前不加that这是宾语从句,连接词 that ,后面加陈述句 how+疑问句,不能同时用.2.all the machines had finished by the end of the following week为什么要...