第2题,
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第2题,
第2题,
第2题,
...is being used for ski jumping (by them)
简单,That steep hill are used for ski jumping.
改为被动语态
is used for ski jumping (by them)
第2题,
第2题,
第2题,
...is being used for ski jumping (by them)
简单,That steep hill are used for ski jumping.
改为被动语态
is used for ski jumping (by them)