Why is so silent in the room? He _________asleep in the room.
A．should beB．must beC．must have beenD．should have been
B
考察情態(tài)動詞。Should意思是應該，must 一定必須。后面接完成時態(tài)，表示對已經(jīng)完成的的動作進行推斷。根據(jù)題意，房間沒為什么如此安靜？他一定是在房間內(nèi)睡著了。到現(xiàn)在還沒醒故選B。
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