【題目】Lisa had travelled to three different countries by herself ________ the age of 20.

A.byB.atC.inD.since

【答案】A

【解析】

句意：麗莎到20歲時(shí)已經(jīng)獨(dú)自一人到過三個(gè)不同的國家。

考查介詞辨析。by不遲于；在……之前；at在 (某時(shí)間或時(shí)刻) ；in在 (某范圍或空間內(nèi)的) 某一點(diǎn)；since自……以來。at the age of 20=in one’s 20 years of age在某人20歲時(shí)，因此選項(xiàng)C不對(duì)；at the age of的時(shí)態(tài)為：一般過去時(shí)、過去進(jìn)行時(shí)；由since引導(dǎo)的時(shí)間狀語從句的時(shí)態(tài)為現(xiàn)在完成時(shí)；由本題的had travelled可知，本題是過去完成時(shí)，因此排除選項(xiàng)B/D；by the age of截止到……年齡；其時(shí)態(tài)為：過去完成時(shí)。故選A。

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