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请英语高手江湖救急,小弟无上拜谢!Themanagerrequiredthatalltheemployeesattheofficebefore9:00inthemorning.A.willarriveB.arriveC.arrivedD.havearrived为什么呢?

题目详情
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?
▼优质解答
答案和解析
C.arrived
从句要与前面主句的时态保持一致