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719.After he became conscious,he remembered ______ and ______ on the head with a rod.
A.to attack;hit
B.to be attacked;to be hit
C.attacking;be hit
D.having been attacked;hit
720.There is a story here in the paper about a 110-year-old man.
My goodness!I can't imagine _____ that old.
A.to be
B.to have been
C.being
D.having been
