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
719.答案是D;remember to do sth.记着要做某事（此事未做）；remember doing sth.记得做了某事（此事已完成）。
720.答案是C;考查imagine doing sth.结构。
