问题
ectric cars become ______ , we’ll need to build more chargingstations
A:which
B:whether
C:that
D:as
B:whether
C:that
D:as
正确答案是：
同类题型
I think I must watch TV now, Dad. I _____ which team will win the game. [ ]
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Cathy, can you answer the door I ______ the room. –I’m coming, mum.
Maria, are those____ knives—No, ____ knives are here.
Now their talks have reached a key stage ____ one side must give in to the other.