Why it get colder when we go up a mountain ?We are getting nearer to the sun !
A. ought to
B. would
C. should
Dmust
网友回答
A. ought to
B. would
(答案→)C. should
D. must
解析：should表示一种相反的意思；诙谐幽默 eg. He should worry about a little money like 5 dollars ? 他不会为5美圆而担心的。