题目

The number of words that we know_______.A. is more and more B. is bigger and biggerC. are more and more D. are bigger and bigger 答案：【答案】B【解析】句意：我们认识的单词的数量越来越大。the number of………的总数，做主语看做单数。表示数目大用big，bigger and bigger越来多大。结合句意，故选B。根据已知条件求空格内的数量