______ many times, this radio receiver is found very sensitive.A、Being testedB、

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

选项 A、Being tested
B、Having been. tested
C、Having tested
D、Testing

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 。

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