______many times, this radio receiver is found very sensitive.A、Being testedB、H

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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

解析本题考查非谓语动词的用法。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test应存在被动关系，故排除[C]和[D]。测试的时间在发现灵敏度很高之前，应用现在分词的完成形式，故答案为[B]。

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