They ____（learn）about eight hundred words by the end of last year.
They ____（learn）about eight hundred words by the end of last year.
have learned.
于是我希望您能自己回答...就這樣
我是說為什么不是had learned
have learned.
于是我希望您能自己回答...就這樣
我是說為什么不是had learned
英語人氣：646 ℃時間：2020-03-14 00:27:08
優(yōu)質(zhì)解答
had learned by +過去時間 ,主句謂語動詞用過去完成時態(tài).謂語動詞用 had +過去分詞.
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