{{B}}quEstions 19 to 21 ArE BAsED on thE ConvErsAtion you hAvE just hEArD、{{/B}}

A．thEy wErE ClAssmAtEs in CollEgE.
B．thEy sEE EACh othEr oCCAsionAlly.
C．thEy wEnt to high sChool togEthEr.
D．thEy wErE vEry ClosE in sChool.