The army has grain. They are in a very difficult situation.
A. run down
B. run out of
C. run off
D. run into
网友回答
A. run down
(答案→)B. run out of
C. run off
D. run into
解析：短语辨析。run down水流下，电池用尽，是不及物动词短语，不能跟宾语；run out of用完，用尽，及物短语，可以跟宾语；run off跑离，逃走；run into和…..碰上，撞上。句意：军队已经用完了粮食。他们处在非常困难的境地。所以选B。