【題目】The boss ______ the worker how to do it, or the accident couldn’t have happened.
A.can’t have told
B.ought to tell
C.could have told
D.mustn’t have told

【答案】A
【解析】從句意看，選項(xiàng)是對(duì)過(guò)去的否定推測(cè)，應(yīng)該用can’t have done。句意為：老板不可能告訴工人們?cè)趺醋隽�，否則就不會(huì)發(fā)生事故了。

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