【題目】The number of private cars in China ________ since 2005, but only 15 percent of them ________ made in China.

A. has been increasing; areB. have increased; is

C. has been increased; isD. had increased; are

【答案】A

【解析】

試題分析：考查動(dòng)詞時(shí)態(tài)。根據(jù)since 2005，再根據(jù)動(dòng)作是一直進(jìn)行，所以用現(xiàn)在完成進(jìn)行時(shí)，主語是The number of，謂語動(dòng)詞用第三人稱單數(shù)形式；第二空主語是only 15 percent of them，them指cars，可知謂語動(dòng)詞用復(fù)數(shù)形式，句意：自從2005年以來，中國的私家車數(shù)量一直在增長，但是只有15%是中國制造的。故選A。

【知識(shí)拓展】

1.The number of作主語，后面的謂語動(dòng)詞用單數(shù)形式。The number of students is 60.

2. (1)Since自從……以來（可作介詞和連詞），和現(xiàn)在完成時(shí)態(tài)連用。

He has lived here since he came. 自從他來到這里，就一直在這里住著。

(2)It is /has been+一段時(shí)間+since + 主語+一般過去時(shí)態(tài)+其他。自從做某事有多長時(shí)間了。在這個(gè)句型中如果從句的動(dòng)作是終止性動(dòng)詞，則表示從動(dòng)作開始到現(xiàn)在多長時(shí)間了；如果從句的動(dòng)作是持續(xù)性動(dòng)詞，則表示從動(dòng)作結(jié)束到現(xiàn)在多長時(shí)間了。

It is three years since he joined (終止性動(dòng)詞)the army.他參軍有三年了；

It is five years since he lived（持續(xù)性動(dòng)詞）here. 他住在這兒有五年了。

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