9．The law of gravitywas discovered （discover） by Isaac Newton about 350years ago．

分析 萬有引力定律大約在350年前由艾薩克牛頓發(fā)現(xiàn)的．

解答 答案：was discovered．主語(yǔ)是The law of gravity是動(dòng)詞discover"發(fā)現(xiàn)"的承受者，構(gòu)成被動(dòng)關(guān)系，時(shí)間狀語(yǔ)about 350years ago表示350年前，故用一般過去時(shí)的被動(dòng)語(yǔ)態(tài)was/were+過去分詞，主語(yǔ)是三單，故was，discover的過去分詞discovered，故答案是was discovered．

點(diǎn)評(píng) 一般過去時(shí)的被動(dòng)語(yǔ)態(tài)was/were+過去分詞的呈現(xiàn)，各種時(shí)態(tài)的被動(dòng)語(yǔ)態(tài)的構(gòu)成要理解記憶．

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