—Where ____ Margaret have put the empty bottles?
—She ______ them away. They must be somewhere.
A．can; can’t have thrownB．must; needn’t
C．must; must have thrownD．can; must throw
A
本題考查情態(tài)動(dòng)詞+have done表示對過去事實(shí)的推測的用法。must have done用于肯定句中，疑問句否定句中應(yīng)用can could代替must。故選A。
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