专四
A． must be
B． would have been
C． must have been
D． would be
情态动词题。must+have been／done用来推测过去发生的动作或存在的状态；must+be／do用来表示对现在发生的动作或存在的状态进行推测。本句中，因为动作发生在过去，故应用must+have been这种形式。
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根据以下资料，回答题：
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