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Many tests________that people generally feel best under certain temperature,humidity,and air speed conditions.

A.will be indicated        B.are indicated

C.have indicated         D.had indicated

 

C 

 

考查时态和语态。tests和indicate之间是主谓关系,且句中没有表示过去的时间状语,故选现在完成时。句意为:许多试验已经表明,人们在一定的温度、湿度和空气流动的速度下,感觉最舒适。

 

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