What a pity! I ______in Hainan two more days，but something urgent needed to be dealt with back home.
A．must have stayed
B．needn't have stayed
C．may have stayed
D．could have stayed
D
must have done對過去發(fā)生的事情的肯定推測，只用于肯定句；needn't have done“本不需要做某事，結(jié)果做了”；may have done對過去發(fā)生的事情的語氣不是很肯定的推測，只用于肯定句；can have done用于肯定句意思是“本來能夠做某事，但是沒做”；用于否定句和疑問句表示對過去發(fā)生的事情的推測。由句意可知要用D項。
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