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

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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
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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
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

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
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

1 when did bealize
2 The abacus was invented by Chinese people in the sixth century.

1.When did realized
2 The abacus was invented by Chinese people in the sixth century.

问问题要说清楚,第一题一共要几个空?长短不一样什么意思?
2.The abacus was invented by the Chinese people in the sixth century.