画线句提问We plant trees twice a year.twice 被画线

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画线句提问We plant trees twice a year.twice 被画线
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画线句提问We plant trees twice a year.twice 被画线
画线句提问
We plant trees twice a year.twice 被画线

画线句提问We plant trees twice a year.twice 被画线
楼上错了:
How many times do you plant trees a year?

How often do you plant trees a year ?

how often do you plant trees a year?
对于频率提问用how often..

How often do you plant trees a year