According to the report ,the number of animais used in experiments( ) by 30/100 over the year.

题目

According to the report ,the number of animais used in experiments( ) by 30/100 over the year.
（ 求解题方法).这是一道英语选择题,有四个备选答案,分别为 A .was reduced B.has been reduced C.were reduced D.have been reduced.第2题 ---Mary has caught a bad coid.----Has she?I regret( ）her to put on more clothes yesterday.A .not to renmind B.not to be reminded C.not reminding D.not being reminding.

答案

B.has been reduced the number是主语,所以单数,over the year过去的一年期间,一段时间,且已经完成,完成体
C.not reminding 用ing表示后悔做了某事,否定词not前置,用不定式表将来,与regret的意思不合适,而且这儿是主动式,所以C