问题描述：
your father ____be in his room.i saw him go out just now.A.can B.can't C.must D.mustn't
did you find him___ in the lake when you passed by A.swim B.swimming C.swam D.to swim
the bus didn't ____ until 3:00p.m.A.get B.get to C.reach D.arrive
did you find him___ in the lake when you passed by A.swim B.swimming C.swam D.to swim
the bus didn't ____ until 3:00p.m.A.get B.get to C.reach D.arrive
问题解答：
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