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(dòng)詞＋have done。句意：她本該抓住這個(gè)機(jī)會(huì)，但是不幸的是，她讓機(jī)會(huì)溜走了。should have done本該做某事(而事實(shí)上并沒有做)，表示對(duì)過去動(dòng)作的虛擬。must have done一定做了(表示推測(cè))；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(cè))。根據(jù)句意選A。
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