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

試題分析:句意,隨著現(xiàn)代社會的發(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)行的動作,用現(xiàn)在進(jìn)行時;當(dāng)主語后面有as well as短語時,謂語動詞不受這些短語的影響,仍然與主語保持一致,主語是E-mail,故用is。
點(diǎn)評:英語中的時態(tài)主要由動詞的形式?jīng)Q定,因此在學(xué)習(xí)英語時態(tài)時,要注意分析動詞形式及具體語境,想象在那個特定的時間動作所發(fā)生的背景,這個動作是經(jīng)常性動作、一般性動作、進(jìn)行性動作、完成性動作還是將要發(fā)生的動作。在英語中,句子的主語和謂語動詞要保持?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.語法一致原則。句子的主語是單數(shù)形式,謂語動詞要用單數(shù)形式;主語是復(fù)數(shù)形式,謂語動詞用復(fù)數(shù)形式2.意義一致原則即謂語動詞該用單數(shù)還是復(fù)數(shù)取決于主語所表達(dá)的內(nèi)容在含義是單數(shù)意義還是復(fù)數(shù)意義。3.鄰近原則謂語動詞該用單數(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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