问题
选择题
My sister started ice skating ____she was four.
A. because B. when C. so
答案
答案：B
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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My sister started ice skating ____she was four.
A. because B. when C. so
答案：B
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