i don't know when i should leave 同意句i don't know _________________英语解答

i don't know when i should leave 同意句
i don't know _____________________________(三空)
和
we must learn english well.(用necessary改写)
it's ____________________________ ________english well

人气：273 ℃　时间：2019-09-18 23:08:05

解答

i don't know when i should leave 同意句
i don't know when to leave.
we must learn english well.(用necessary改写)
it's necessary for us to learn english well