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

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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“明珠暗投；对牛弹琴”，故选B。

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专业英语四级

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