A. 不填；theB. 不填；不填

　　　C. the; 不填 D. the; the

　　选A。in charge of 的意思是“负责”、“管理”，其主语通常是人；in the charge of 的意思是“由……负责或管理”，其主语通常是物。

　　18. After the new technique was introduced the factory produced

　　cars in 1994 as the year before.

　　A. as twice many

　　B. as many twice

　　C. twice as many

　　D. twice as

　　选C。倍数表达式：A+ be+倍数+ as +adj. / adv. (原级)+as +B。又如：The book is ten times as thick as that one。

　　19. There were two boys in the lab,

　　did the experiment successfully.

　　A. the clever of whom

　　B. the cleverer or whom

　　C. the clever of them

　　D. the more clever of them

　　选B。“the + 形容词比较级+of+名词复数”表示“两者中较…的一个”；此处关系代词whom指代the two boys.

　　20. I think I was at school,

　　I was staying with a friend during the vacation when I heard the news.

　　A. even so

　　B. and then

　　C. so that

　　D. or else

　　选D。or else 用作连词，意为“否则；不然”，其余各项与语境相悖。

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