题目内容：
根据短文内容，回答题。Once upon a time a poor farmer taking a sack of wheat to the mill did not know what to do when it slipped from his horse and fell ____51 ____the road. The sack was too heavy for him to ____52____ , and his only hope was that ____53____ some one would come riding by and lend a hand.
It was not long before a rider appeared, but the farmer' s heart sank when he____ 54 ____him, for it was the great man who lived in a castle nearby. The farmer ____55____ have dared to ask another farmer to help, or any poor man who might have come ____56____ the road, but he could not beg a favor of so great a man. ____57 ____, as soon as the great man came up he got off his horse, saying "I see you've had bad luck, friend. How good it is that I' m here just at the ____58____ time. "Then he took one ____59____ of the sack, the farmer the other, and between them they lifted it on the horse.
"Sir," asked the farmer, "how can I pay you?"
"Easily enough," the great man ____60____ "Whenever you see anyone else in trouble, do the
same for him. "
________ A．on
B．in
C．off
D．onto
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