问题
Lily, whose backpack is this — I think it _____ be Peter’s. Look! His name is on it.
A:can
B:should
C:must
D:Could;
B:should
C:must
D:Could;
正确答案是：
同类题型
It is well known that _________ air and water are harmful to people’s health.
How are you getting along ________ Lingling afteryour last argument— We become friends again.
_______in your city now—–Very hot at noon but very cool at night.
_____ you find _______ ways to work out this problem, Jim — Yes, I ______.