i could swim when i was six years old为什么用swimi could swim when i was six years old为什么用swim而不是swimming

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• 几道英语填词题1.你能告诉我去动物园的路吗?----- ------ me ------ -------- the zoo 2.I was a middle school student last year.I —— a middle school student—— last year.3.She could swim in the river when she was six years old .She could swim in the river —— —— —— six years old .没有缺空，这是《寒假学与练》上的
• i could swim when i was six years old为什么用swim
• i could swim when i was six years old为什么用swimi could swim when i was six years old为什么用swim而不是swimming
• When my cousin Julia eats chocolate,she feels bad,
• 同义句转换 I could swim when I was 10 years old.I could swim----- ------10.I could swim-----10---- ------.