题目内容
句型转换
We must stop the sand from moving toward the farmland.
（改为同义句）We must ________ the sand ________ ________ toward the farmland.
答案：keep;from;moving
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题目内容
句型转换
We must stop the sand from moving toward the farmland.
（改为同义句）We must ________ the sand ________ ________ toward the farmland.