Today's topic is ''Participle''

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Nov 12, 2011 01:33
Today I try my a shortcoming in English. It is participle construction.This is the most weak point in English grammer for me.So I reviewed this.

For example.
I had my diary corrected by someone.
The man watching TV program who is thinking about diary.
A written diary was corrected by someone.
I make someone corrected my diary.

I have question.
(_____) how to stimulate the economy,the Japanese goverment has yet to take any effective measures.
(A)Knowing not (B)Not knowing (C)No knowing (D)Not to know

Answear is B.
Why? Please help me!!