( )The garden _______ at once because the flowers are so dry.

问题描述:

( )The garden _______ at once because the flowers are so dry.
A.must water B.must be water C.must watered D.must to water为什么

花园肯定是被浇水,使用被动结构.
选择B
must be+过去分词的结构表示被动