D.is doing
因?yàn)檫@句話的主語(yǔ)是Mr.Smith,是單數(shù)形式,而with several students是它的伴隨狀語(yǔ),所以這句話的主語(yǔ)是單數(shù)形式,謂語(yǔ)動(dòng)詞也要用單數(shù)形式.那為啥 不選 ab呢因?yàn)楹竺娴臅r(shí)間狀語(yǔ)是now,是現(xiàn)在進(jìn)行時(shí),所以不能選A(一般現(xiàn)在時(shí))和B(一般過去時(shí))
MR.Smith with several students___experiments in the lab now.a.do b.did c.are doing d.is doing
MR.Smith with several students___experiments in the lab now.a.do b.did c.are doing d.is doing
英語(yǔ)人氣:352 ℃時(shí)間:2020-05-13 11:07:42
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