几道PP语法题？

wdzc

64. Lactose, a sugar present in milk, is
   one of simple sugars used in food
   preparations for infants.

答案是C,想不清楚为什么是C，我觉得是B,应该改为presenting.

96. Cyclamates were introduced in the early 1950's
   as alternative sweeteners for use by individuals
   who needed reducing their sugar intake for
   medical reasons.
答案是D,我想needed在这里做实意动词，后面可以接名词，如：
My car needs reparing.
但是在这里reducing their sugar intake 是一个动名词词组，所以要改为needed to reduce their sugar intake.

teddy-bear

one of the simple

needed to be

lucyyyh

64. present在这里可以做adj. 表示now existing...   所以整个是adj.短语做定语修饰a sugar.

96. need doing= need to be done是表示被动的意思.这里的need是表示"需要"作实义动词,
need to do sth.