The river smells terrible. People_______ dirty things into it .
A．must stop to throwB．must stop from throwing
C．must be stopped to throwD．must be stopped from throwing
D

試題分析：考查推測(cè)，must have done表示對(duì)對(duì)去事情的肯定推測(cè)，名詞People和動(dòng)詞詞組stop from是動(dòng)賓關(guān)系，所以用被動(dòng)式，句子意思“河水很難聞，人們一定是把臟東西仍在河水里”,所以選D
點(diǎn)評(píng)：推測(cè)是個(gè)難點(diǎn)，must have done表示對(duì)對(duì)去事情的肯定推測(cè)；may have done表示對(duì)過去事情的不可定推測(cè)
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