My sister started ice skating she was four.A. because B. when C. so

发布时间：2020-08-20 19:06:41

My sister started ice skating     she was four.
A. because   B. when   C. so

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解析：题中的意思是当妹妹在哪个年龄的时候开始学ice skating（滑冰）所以用when
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