20.Mr.Chan believes that his daughter will be very happy____she knows the good news.a before b after c untild once为什麼不是b呢?

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20.Mr.Chan believes that his daughter will be very happy____she knows the good news.a before b after c untild once为什麼不是b呢?
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20.Mr.Chan believes that his daughter will be very happy____she knows the good news.a before b after c untild once为什麼不是b呢?
20.Mr.Chan believes that his daughter will be very happy____she knows the good news.
a before
b after
c until
d once
为什麼不是b呢?

20.Mr.Chan believes that his daughter will be very happy____she knows the good news.a before b after c untild once为什麼不是b呢?
如果是b的话,后面的时态就应该用一般过去时了,应该是after she knew the good news.
故应该选D ,once,一旦

once 是一旦的意思

D更为贴切！原因是once是“一.....就”的意思，“陈先生相信他的女儿一听到这个好消息就会非常开心” 而"after"就没有那种一听到就会开心的氛围，不能够充分表达他女儿的开心程度，故选D

after貌似后面不可以加句子吧

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