初3英语单选一道My advice is ____more trees_____in front of the building.A.that,be planted B.that,to be planted C.whether,will be plantedD.if ,are planted 选哪个,why?

初3英语单选一道My advice is ____more trees_____in front of the building.A.that,be planted B.that,to be planted C.whether,will be plantedD.if ,are planted 选哪个,why?
初3英语单选一道
My advice is ____more trees_____in front of the building.
A.that,be planted
B.that,to be planted
C.whether,will be planted
D.if ,are planted
选哪个,why?

初3英语单选一道My advice is ____more trees_____in front of the building.A.that,be planted B.that,to be planted C.whether,will be plantedD.if ,are planted 选哪个,why?
A
that引导表语从句
advice后面用虚拟语气,should省略