1.（When I got to school）,I realized I had left my backpack at home 对括号里的提问
_____ ＿＿＿ you _________ you had left your backpack at home?
2.Chinese people invented the abacus in the sixth century
改为被动语态
人气：482 ℃ 时间：2019-12-04 02:17:47
解答
1 When did realize.
问时间点,用when
2 The abacus was invented by Chinese people in the sixth century.
abacus为单数,用过去式was
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