填:had given
was giving 是過去動(dòng)作,在此之前曾給其他幾群人作過同樣的報(bào)告,
故應(yīng)用過去完成時(shí).
句意:我當(dāng)時(shí)正在給一群人作報(bào)告,在此之前我曾給其他幾群人作過同樣的報(bào)告
I was giving a talk to a group of people.I____ the same talk to other groups before.
I was giving a talk to a group of people.I____ the same talk to other groups before.
英語人氣：510 ℃時(shí)間：2020-03-21 23:27:11
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