When should we plant the trees They (〉in spring.Aare plantedBmust plantCneed not plantDmust be planted

问题描述:

When should we plant the trees They (〉in spring.
Aare planted
Bmust plant
Cneed not plant
Dmust be planted

D ,tree 是plant的承受着,是被种植

D they 和plant是被动的关系,b c不是被动,错误 A的话,语态对啦,不过意思上不如d好
它们必须在春天被种植

d.
我们应该什么时候种树?
它们必须在春天被种植.

A