The plane ____ arrive at 11:30 a.m.,but it was an hour late.A.was about to B.was likelyC.was supposed to D.was certain to87.143

The plane ____ arrive at 11:30 a.m.,but it was an hour late.A.was about to B.was likelyC.was supposed to D.was certain to87.143
The plane ____ arrive at 11:30 a.m.,but it was an hour late.
A.was about to B.was likely
C.was supposed to D.was certain to
87.143

The plane ____ arrive at 11:30 a.m.,but it was an hour late.A.was about to B.was likelyC.was supposed to D.was certain to87.143
be supposed to :应该做某事而没做,根据题意选c咯