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plastic bags are useful for holding many kinds of foods,___

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plastic bags are useful for holding many kinds of foods,___ their cleamess,toughness,and low cost
A.by way of
B.by virtue of
C.because
D.in case of
plastic bags are useful for holding many kinds of foods,___
C
塑料袋被用来装很多食物,因为他们干净,坚固,低成本.
再问： 能稍微解释一下吗
再答： 哦，不好意思·~ 此处应该用because of~~ because 是连接句子的，此处是直接连接名词，所以要加上of， 介词短语直接连接名词 答案是选B by virtue of=because of 由于，因为~~~后面直接接名词性成分
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