--- 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; shouldB．may; can C．should; must D．must; should
D
考查情態(tài)動詞：第一空填must表示猜測：一定是，第二空填should have done“本該做…卻沒做“，句意是：--這場霧很大，高速公路一定關(guān)了。--你是對的，--我本該想到的，現(xiàn)在只好另外走一條路了。選D。
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