______ 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

解析本题考查被动的完成时。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应存在着被动关系，故排除C 和D 。测试的时间在发现灵敏度很高之前，应用完成时的现在分词形式在句中作状语，故答案为B 。

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______manytimes,thisradioreceiverisfoundverysensitive.A、BeingtestedB、