18．We      on this project for four hours．Let's have a rest．（　�。�
A．are workingB．have been working
C．workedD．had worked

分析 句意：我們一直在做這個(gè)項(xiàng)目已4個(gè)小時(shí)．讓我們休息一下吧．

解答 答案B．句中時(shí)間狀語(yǔ)"for four hours"通常與現(xiàn)在完成時(shí)連用，排除A、C和D選項(xiàng)．分析語(yǔ)境"Let's have a rest"可知，我們一直在做工作，說(shuō)明"work on the project"動(dòng)作在過(guò)去就已經(jīng)開(kāi)始，一直持續(xù)到現(xiàn)在，因此用現(xiàn)在完成進(jìn)行時(shí)，故選B．

點(diǎn)評(píng) 本題考查時(shí)態(tài)的用法．解答此類題目的關(guān)鍵是要讀懂句意，分析上下文的語(yǔ)境，判斷時(shí)態(tài)，鎖定答案．

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