It will be casting pearls before______because he does not know how to appreciate

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问题 It will be casting pearls before______because he does not know how to appreciate favors.

选项 A、cow
B、swine
C、dog
D、sheep

答案 B

解析固定搭配题。cast pearls before swine是固定搭配，表示“对牛弹琴”，故选[B]。

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Itwillbecastingpearlsbefore______becausehedoesnotknowhowtoappreciate