______ many times this radio receiver is found very sensitive.A.Being testedB.Having been

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______ many times, this radio receiver is found very sensitive.

A.Being tested

B.Having been. tested

C.Having tested

D.Testing

热搜:关于氨基酸代谢错误的论述是_________。

答案解析

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  • 正确答案:B
    解析:由题干可知,所填分句的逻辑主语应该是主句的主语this radio receiver,它和分句的谓语动词存在着被动关系,从而排除C 和D 。又因为完成时的现在分词形式在句中作时间状语,表明测试的时间在发现灵敏度很高之前,而A being tested不能够表达这一含义,故答案为B 。