before 后面引導(dǎo)的是一個(gè)時(shí)間狀語(yǔ)從句,必須是完整的句子,所以,選B.
選A容易引起歧義,可以解讀成：在被發(fā)明的紙張面前,人們用什么.這不合題意,
What did people use before paper__________?A.invented B.was invented
What did people use before paper__________?A.invented B.was invented
What did people use before paper__________?
A.invented B.was invented
可A為啥不行?
What did people use before paper__________?
A.invented B.was invented
可A為啥不行?
英語(yǔ)人氣：497 ℃時(shí)間：2020-07-12 21:24:24
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