开垦土地
参考答案：
是指以垦殖为目的开发土地，即开垦荒地为耕地用于农作物的种植。
If they had known what was coming next, they _____ their mind. [ ]
A. may change
B. could change
C. must have changed
D. might have changed
这辆红色轿车可以在该车道行驶。
