It is important that the hotel receptionist _____ that guests are registered correctly.
A、has made sure
B、will make sure
C、make sure
D、made sure
【正确答案】：C
【题目解析】：答案选C。“It is + adj. + that从句……”句型表示建议、命令、要求等，that从句使用虚拟语气，即从句谓语动词用“should +动词原形”，should 可以省略。
