选择题:Once upon a time a poor farmer taking a sack of wh

题目内容:
Once upon a time a poor farmer taking a sack of wheat to the mill did not know __1__ to do when it slipped from his horse and fell __2__ the road. The sack was __3__ heavy for him to lift, and his only hope was that presently some one would come riding by and lend a hand. 第三空
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