these new books must ______ before the teacher comes to the classroom

问题描述:

these new books must ______ before the teacher comes to the classroom
A be given out
B gave out
C are given away
D give out +

A be given out
must 是情态动词,后面要加动词的原型.所以BC都不对,另外,注意书是被分发的,book 跟give out 是动宾关系,用被动语态,所以选A