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

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

admin2010-01-15  56
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 语法结构题。本句的难点是：完成时的现在分词形式在本句中作时间状语，表明测试的时间在发现灵敏度很高之前，being tested不能够表达这一含义，而having tested 和testing动作的主体和逻辑主语为人，造成时间状语的逻辑主语和主句的主语不一致，故只能选B 。本句的意思是：经过多次测试以后，发现这台无线电接收机的灵敏度很高。
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