深圳育德幼儿园:once harm____(do)to the environment,it takes years to have the system recovered.
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done,完成时,表示"一旦破坏了环境"
did,虚拟语气
is done
once harm IS DONE to the environment,it takes years to have the system recovered.
once harm____(do)to the environment,it takes years to have the system recovered.
once you've promised to do something
he was asked to do the experiment at once 怎么译
All which I shoud do is to start working at once.
I`m going to join them. I`ll try my best __B__ I do it. A.if B.when C.once 为什么选B
want to sb to do
help to do 用法
how to do?
be to do是什么意思
to help do 造句