---who______it be that is knocking at the door? ---It_______be Father, but I’m not sure. A.c.
---who______itbethatisknockingatthedoor?---It_______beFather,butI’mnotsure.A.can,must...
---who______it be that is knocking at the door? ---It_______be Father, but I’m not sure. A.can, must B.can, may C.must, can D.may, must
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