单选题 They insisted that the device ______ under operating conditions.
  • A. would be tested
  • B. be tested
  • C. to tested
  • D. be testing
【正确答案】 C
【答案解析】[解析] 此题测试虚拟语气的用法。动词insist，recommend，suggest等动词后跟的从句用虚拟语气，谓语应为(should+)动词原形。而且装置(device)是被测试，所以谓语动词应用被动语态，故答案是C)。