--Why was Yu Gong trying to move the mountains?--Because it was()_ for his family to get to the other side of the mountains.
A.difficulty B.difficulties C.difficult D.most difficult正确答案C
--Why was Yu Gong trying to move the mountains?--Because it was()_ for his family to get to the other side of the mountains.
A.difficulty B.difficulties C.difficult D.most difficult正确答案C