问题
选择题
--- The fog is so thick that the express way ____ have been closed.
--- You are right. I ____ have thought of that. Now we have to take another road.
A.can; should
B.may; can
C.should; must
D.must; should
答案
答案:D
考查情态动词:第一空填must表示猜测:一定是,第二空填should have done“本该做…却没做“,句意是:--这场雾很大,高速公路一定关了。--你是对的,--我本该想到的,现在只好另外走一条路了。选D。