2015
高考英语人教版一轮复习课时练习及答案：必修3u4 unit 4 astronomy：the science of the stars ⅰ.单项填空 1．________a certain doubt among the workers as to the necessity of the work. a．it existed b．there existed c．there had d．it had 解析 句意：对于做这份工作的必要性，工人们存在一定的疑惑。there exists/existed...有；存在；相当于there be....结构。答案 b 2．when the young man came back，t
