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—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
 本題考查動詞時態(tài)。句意為 ; —— 阿蘭看上去很疲憊。 —— 當然了 ,  他在健身房里連續(xù)健身鍛煉了兩個小時了。根據 looks 的時態(tài)排除 B 、 D 兩項。 A 項是一般現(xiàn)在時 ,  表示經常性、習慣性的動作。而 C 項為現(xiàn)在完成進行時 ,  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)下去的動作。 
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