[填空题]Doctors who behaved in a fraudulent manner were treated in the same way as ordinary criminals during the Tang era.

Long long ago, there were two men who had a very fierce quarrel. They argued for a long time, but still they couldn’t settle the problem. The incident occurred one morning outside Albert Schweitzer’s hospital in the African jungle. A patient who lived in the hospital had gone fishing in another man’s boat without permission. He succeeded in getting a tot of fish. Finding out what the patient had done, the owner of the boat thought that he should be given all the fish that were caught. Dr. Schweitzer said to the boat owner:
"You are right because the other man ought to have asked permission to use your boat. But you are wrong because you are careless and lazy. Though you have the boat, you don’t make good use of it. You merely twisted the chain of your canoe round a palm tree instead of fastening. it with a padlock. Of laziness you are guilty because you were asleep in your hut on this moonlit night instead of making use of the good opportunity
A. the canoe did not really belong to him
B. he should have locked his boat to a tree
C. he wasted a good fishing night
D. Both B and C