She________the opportunity，but unfortunately she just let it go.
A．should have takenB．must have taken
C．needn't have takenD．can't have taken
A
A　考查情態(tài)動詞＋have done。句意：她本該抓住這個機(jī)會，但是不幸的是，她讓機(jī)會溜走了。should have done本該做某事(而事實(shí)上并沒有做)，表示對過去動作的虛擬。must have done一定做了(表示推測)；needn't have done本不必做某事(而事實(shí)上做了某事)；can't have done肯定沒做某事(表示推測)。根據(jù)句意選A。
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