—I knocked but nobody answered the door.
----They _____asleep then and didn’t hear you.
A．must beB．should beC．must have beenD．should have been
C
考察虛擬語氣.句意:我敲門但是沒有人開門._那時候他們一定是已經(jīng)睡著了,沒有聽到你敲門. “must+have+done”表示對過去事情的肯定推測，譯成“一定做過某事”故選C.
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