With the development of modern society, E-mail as well as telephones     an important part in daily communication.

A.have playedB.is playingC.a(chǎn)re playingD.had played

B

解析試題分析:句意,隨著現(xiàn)代社會(huì)的發(fā)展,電子郵件和電話正在人們的日常交流中扮演著重要角色。表示現(xiàn)階段正在進(jìn)行的動(dòng)作,用現(xiàn)在進(jìn)行時(shí);當(dāng)主語(yǔ)后面有as well as短語(yǔ)時(shí),謂語(yǔ)動(dòng)詞不受這些短語(yǔ)的影響,仍然與主語(yǔ)保持一致,主語(yǔ)是E-mail,故用is。
考點(diǎn):主謂一致及時(shí)態(tài)考查題
點(diǎn)評(píng):英語(yǔ)中的時(shí)態(tài)主要由動(dòng)詞的形式?jīng)Q定,因此在學(xué)習(xí)英語(yǔ)時(shí)態(tài)時(shí),要注意分析動(dòng)詞形式及具體語(yǔ)境,想象在那個(gè)特定的時(shí)間動(dòng)作所發(fā)生的背景,這個(gè)動(dòng)作是經(jīng)常性動(dòng)作、一般性動(dòng)作、進(jìn)行性動(dòng)作、完成性動(dòng)作還是將要發(fā)生的動(dòng)作。在英語(yǔ)中,句子的主語(yǔ)和謂語(yǔ)動(dòng)詞要保持?jǐn)?shù)上的一致關(guān)系,叫主謂一致。這種關(guān)系通常要遵循下面三條原則:1.語(yǔ)法一致原則。句子的主語(yǔ)是單數(shù)形式,謂語(yǔ)動(dòng)詞要用單數(shù)形式;主語(yǔ)是復(fù)數(shù)形式,謂語(yǔ)動(dòng)詞用復(fù)數(shù)形式2.意義一致原則即謂語(yǔ)動(dòng)詞該用單數(shù)還是復(fù)數(shù)取決于主語(yǔ)所表達(dá)的內(nèi)容在含義是單數(shù)意義還是復(fù)數(shù)意義。3.鄰近原則謂語(yǔ)動(dòng)詞該用單數(shù)還是復(fù)數(shù)形式,取決于最鄰近它的名詞、代詞或其它詞的數(shù)。

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