do i need to exercise two hours every day?exercise for two hours行吗?表示一段时间为什么没用for呢
问题描述：
do i need to exercise two hours every day?exercise for two hours行吗?表示一段时间为什么没用for呢
答
for 是用在表示从过去的某个时间段开始,一直到句中所指的时间发生的一件时.It has been raining for two hours. 意思是于从两个小时前一直到现在一直在下. Do I need to exercise two hours every day? 其中的 excer...