快高考了.It is said that a polar winter,_____,will stay for more than six month.
快高考了.It is said that a polar winter,_____,will stay for more than six month.
A.once arrives B.once arrived C.once it arrives D.it once arrives
為什么A不行..
A.once arrives B.once arrived C.once it arrives D.it once arrives
為什么A不行..
英語人氣：208 ℃時間：2020-03-24 18:29:06
優(yōu)質(zhì)解答
Once是連詞,在這里引導的條件狀語從句作插入語.句意是“據(jù)說極地的冬天一旦到來,將會持續(xù)六個月以上”.once和if,when等用法差不多,后面引導的從句若主語和主句的主語一致的時候,可以省略主語（你估計是這一點有點糊...
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