问题
选择题
Why ____it get colder when we go up a mountain ?We are getting nearer to the sun !
A．ought to
B．would
C．should
D． must
答案
答案：C
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。