You'd better open the window and let the fresh air _______
问题描述：
You'd better open the window and let the fresh air _______
a.in b .out c.out of d.into.
答
你最好打开窗户让新鲜空气______.
选a.in
let...in 是让...进来的意思
你最好打开窗户让新鲜空气进来.
b.out,意思反了.
c.和d不考虑,因为都是介词,不能不带宾语单独用在句尾.