三个英文题
1.Laughter burst out ( )the audience when the lecturer made a joker
为什么填from among,不填from
2.Lee contributed 50 dollars,but he wishes he could contribute（）
A.another fifty B.more fifty dollars 讲解下
3.He could hardly keep himself alive,( )look after a wife.
A.not to mention B.let alone C.to say nothing of D.not to speak of 四个词讲解下