quEstions 17 to 20 ArE BAsED on A DiAloguE BEtwEEn two CollEAguEs in thE oFFiCE onE night. you now hAvE 20 sEConDs to rEAD quEstions 17 to 20.

whEn DiD thE ConvErsAtion tAkE plACEAt 10:00Am.
B．At 2:00Am.
C．At 12:00 pm.
D．At 10:00 pm.