He has got three ______ A.pair of trainers B pairs of trainer C pairs of trainers D pairs trainers应该选什么?

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He has got three ______ A.pair of trainers B pairs of trainer C pairs of trainers D pairs trainers应该选什么?
He has got three ______ A.pair of trainers B pairs of trainer C pairs of trainers D pairs trainers
应该选什么?

He has got three ______ A.pair of trainers B pairs of trainer C pairs of trainers D pairs trainers应该选什么?
C pairs of trainers
前面是three,所以pair 和trainer都用复数.