Question

—Why can your neighbor know so much about London?
—He ____ have been there before.

A．must

B．can

C．should

D．need

Answer 1

A

考查情态动词用法。考查情态动词表示推测的用法。Must表示有把握的肯定推测。结合句意可知A正确。句意：他以前一定到过那里。