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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