为什么 Whose school bag is heavier,yours or mine?school bag 后面是is不是are?

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为什么 Whose school bag is heavier,yours or mine?school bag 后面是is不是are?

为什么 Whose school bag is heavier,yours or mine?school bag 后面是is不是are?
为什么 Whose school bag is heavier,yours or mine?school bag 后面是is不是are?

为什么 Whose school bag is heavier,yours or mine?school bag 后面是is不是are?
因为主语是bag,是单数,不是复数

school bag是物品 而且是单数