—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(yǔ)氣.句意:我敲門(mén)但是沒(méi)有人開(kāi)門(mén)._那時(shí)候他們一定是已經(jīng)睡著了,沒(méi)有聽(tīng)到你敲門(mén). “must+have+done”表示對(duì)過(guò)去事情的肯定推測(cè)，譯成“一定做過(guò)某事”故選C.
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