21.-- Would you like to visit Shantou City with me this summer vacation?
-- No. I ________ it before. Besides, it's hot and humid in summer.
A.visit B.visited C.will visit D.have visited
22. —What’s wrong with your left hand?
—I got it ______ in the door.
A.catching B.caught C.to be caught D.to catch
23.We asked John and Henry some easy questions, butof them could answer them.
A.none B.neither C.all D.both
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