Mr. Smith has promised that all of us will pass the exam, so it ____ so difficult as you imagine.
A．can’t have been B．can’t be
C．mustn’t have beenD．mustn’t be
B
考察情態(tài)動詞用法。AC是對過去情況的說明。D不能表示推測。Can’t be不可能；結(jié)合句意可知B正確。句意：史密斯先生答應所有人都能通過考試。所以試卷不可能像你想象的那么難。
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