—Allan looks tired out.
—Sure. He      in the gym for two hours.
A．works outB．had worked out
C．has been working outD．was working out
 C
 本題考查動(dòng)詞時(shí)態(tài)。句意為 ; —— 阿蘭看上去很疲憊。 —— 當(dāng)然了 ,  他在健身房里連續(xù)健身鍛煉了兩個(gè)小時(shí)了。根據(jù) looks 的時(shí)態(tài)排除 B 、 D 兩項(xiàng)。 A 項(xiàng)是一般現(xiàn)在時(shí) ,  表示經(jīng)常性、習(xí)慣性的動(dòng)作。而 C 項(xiàng)為現(xiàn)在完成進(jìn)行時(shí) ,  表示過去發(fā)生 ,  持續(xù)到現(xiàn)在而且有可能繼續(xù)持續(xù)下去的動(dòng)作。 
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