请英语高手江湖救急,小弟无上拜谢!The manager required that all the employees ________ at the office before 9:00 in the morning.A.will arrive B.arrive C.arrived D.have arrived为什么呢?

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请英语高手江湖救急,小弟无上拜谢!
The manager required that all the employees ________ at the office before 9:00 in the morning.
A.will arrive    B.arrive      C.arrived        D.have arrived
为什么呢?

C.arrived
从句要与前面主句的时态保持一致

B 虚拟,原形,省略should

B
应该是 should arrive,此处省略了should

B. arrive