---Thefogissothickthattheexpresswayhavebeenclosed.---Youareright.Ihavethoughtofthat.Nowwehavetotakeanotherroad.A．can;shouldB．may;canC．should;mustD．must;should

Question

--- 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

Answer 1

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。