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my blue trousers---worn out.one pair of trousers---not enoug

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my blue trousers---worn out.one pair of trousers---not enough
A IS are B are is C is is D are is
B
再问: 为什麽不用单数?
再答: 当眼镜, 裤子, 袜子, 鞋 等做主语时, 谓语一般用复数。 但当前面用 a pair of 修饰时, 谓语在数上和pair 一致, 即用单数