About the sixth century A. D. when few Europeans could read, the Chinese ____paper. (2 分)
About the sixth century A. D. when few Europeans could read, the Chinese ____paper. (2 分)
A. invented
B. had invented
C. have invented
D. had been invented.
A. invented
B. had invented
C. have invented
D. had been invented.
英語人氣：349 ℃時間：2020-04-04 12:40:36
優(yōu)質(zhì)解答
B這是一個過去完成時,發(fā)生在 前半句話( 它已發(fā)生在過去時了）的前面
我來回答
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