Do you know — In the 6th century.A.who is the abacus invented B.
Do you know — In the 6th century.A.who is the abacus invented B.
Do you know — In the 6th century.A.who is the abacus invented B.when the abacus is invented C.when was the abacus invented D.when the abacus was invented
Do you know — In the 6th century.A.who is the abacus invented B.when the abacus is invented C.when was the abacus invented D.when the abacus was invented
英語(yǔ)人氣：852 ℃時(shí)間：2020-04-03 13:46:26
優(yōu)質(zhì)解答
選D～～～～～～～～～～～～～算盤(pán)是什么時(shí)候發(fā)明的．was不用改成is嗎？既然回答是在過(guò)去的時(shí)間里發(fā)生的．問(wèn)句只能體現(xiàn)在謂語(yǔ)動(dòng)詞里了．所以用WAS不是有do嗎when 引導(dǎo)的從句與主語(yǔ)是可以分開(kāi)來(lái)的． 作從句的主語(yǔ)為算盤(pán)的句子是個(gè)被動(dòng)句，結(jié)構(gòu)為：be+Ved的形式
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