—Why can your neighbor know so much about London?
—He ____ have been there before.
A．mustB．canC．shouldD．need
A
考查情態(tài)動(dòng)詞用法�？疾榍閼B(tài)動(dòng)詞表示推測的用法。Must表示有把握的肯定推測。結(jié)合句意可知A正確。句意：他以前一定到過那里。
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