Bob said he was going to join our club but he didn’t. What a shame! He ______ his mind.
A．can’t have changedB．mustn’t have changed
C．wouldn’t have changedD．shouldn’t have changed
D
考查情態(tài)動詞與虛擬語氣。shouldn’t have done 本不應(yīng)該做某事而實際上做了，can’t have done/ wouldn’t have changed表示對過去的推測，不可能，must表推測不用于否定句中，句意：鮑勃說要加入我們的俱樂部但是他沒來。多遺憾呀，他本不應(yīng)該改變主意的。故選D。
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