He sat on heavily, looking
out over his land. If he had his buffalo back, if he had his plow that they had
burned for fuel, he could plow the land. But when he thought of this as he did
many times every day, he felt helpless as a leaf tossed upon the flood. The
buffalo was gone; gone also his plow a...
The CDs are _______! Buy one and you get one completely free. A. on sale B. for sale C. in sale D. with sale 选项 C 和D 比较好排除,但分不清是 on sale 还是 for sale,求讲解!谢谢!