I'm sorry to learn that you have made no ______ (improve) on the design at all.
查看答案
It's rather difficult for me to make such a _______ (decide).
They stopped ________ (talk) when the teacher came in.
He suddenly remembered that his schoolbag_____ at home.
A. has been forgotten
B. had been forgotten
C. has been left
D. had been left
He must be an honest boy, ____ can be seen from his behavior.
A. that
B. what
C. which
D. when
微信支付 
支付宝支付