第1个回答 2010-12-03
I just know the answer to a question, so I answered one.
第2个回答 2010-12-03
I just know one answer of the questions, so I anwered one question本回答被提问者采纳
第3个回答 2010-12-03
Because I had no idea of the problems but one, so I just answered it.
第4个回答 2010-12-03
I only answered one question that i knew the key.
第5个回答 2010-12-03
I only know answers to one question so answered a