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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
 本题考查动词时态。句意为 ; —— 阿兰看上去很疲惫。 —— 当然了 ,  他在健身房里连续健身锻炼了两个小时了。根据 looks 的时态排除 B 、 D 两项。 A 项是一般现在时 ,  表示经常性、习惯性的动作。而 C 项为现在完成进行时 ,  表示过去发生 ,  持续到现在而且有可能继续持续下去的动作。 
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