阅读下文，回答 题 Once upon a time a poor farmer taking a sack of wheat to the mill did not

阅读下文，回答 题

Once upon a time a poor farmer taking a sack of wheat to the mill did not know56to do when it slipped from his horse and fell57the road. The sack was58heavy for him to59, and his only hope was that60some one would come riding by and61a hand.

It was not long62a rider appeared, but the farmer' s heart sank when he63him, for it was the great man who lived in a castle nearby. The farmer64have dared to ask65 farmer to help, or any poor man who might have come66the road, but he could not beg a 67of so great a man.68, as soon as the great man came up he got69his horse, say-ing "I see you' ve had bad luck, friend. How good it is70I' m here just at the71 time. "Then he took one72of 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 man73 "Whenever you see74else in trouble,75 the same for him. "

请回答（56）题 查看材料

A.how

B.what

C.which

D.whether