LI Ming ----50 dollars buying gifts for his familya,cost b.costs c.spend d.spent说下为什么

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LI Ming ----50 dollars buying gifts for his familya,cost b.costs c.spend d.spent说下为什么
LI Ming ----50 dollars buying gifts for his family
a,cost b.costs c.spend d.spent
说下为什么

LI Ming ----50 dollars buying gifts for his familya,cost b.costs c.spend d.spent说下为什么
D
spend的主语是人
cost的主语是物
所以排除AB
因为给他家买礼物是过去的事情了
所以用过去式spent
所以选D
sb spend sth doing sth 是一个句型

d