如often,sometimes,ever,never,twice,on several occasion等:
Have you ever been to Beijing?
你以前去过北京吗?
I have never heard Bunny say anything against her.
我从来没有听到Bunny说她的坏话。
I have used this pen only three times. It is still good.
这支钢笔我只用过三次。它仍然是好的。
George has met that gentleman on several occasions.
乔治已经在好几个场合见过那个先生几次。
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