2. 考研
  3. When a post office handles Alarge quantities of mail daily, it is essential that mechanical methods Bare used Cto maintain produ

When a post office handles Alarge quantities of mail daily, it is essential that mechanical methods Bare used Cto maintain produ

admin2005-06-26  117
问题 When a post office handles Alarge quantities of mail daily, it is essential that mechanical methods Bare used Cto maintain production and insure Dprompt delivery of the mails.
选项
答案B错，应该改为“be used”。
解析 “essential”引导的从句应该用虚拟语气。从句的谓语动词应该是“(should)+动词原形”，所以应该把“are used”改为“be used”。
转载请注明原文地址:https://www.kaotiyun.com/show/1Tmi777K
0

在职申硕（同等学力）英语

相关试题推荐
随机试题
最新回复(0)