While attempting to look into the case, ______.
A、
he found it was difficult
B、
the case was difficult
C、
it happened that the case is difficult
D、
difficult as the case
【正确答案】
A
【答案解析】
逻辑主语。本题中状语部分非谓语形式是现在分词attempting，是主动形式，所以主语应该是人。故答案为A。
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