这是一个复合句.主句:do you know 从句:who invented the toothpaste 主句是一般疑问句而从句是特殊疑问句时,通常会出现这种把疑问词提到句首的情况.例如:What do you think your brother will give you as your birthday present?
也有人把do you know 看成插入语,不过这样的话,上例就不好理解了.
这是一个复合句.主句:do you know 从句:who invented the toothpaste 主句是一般疑问句而从句是特殊疑问句时,通常会出现这种把疑问词提到句首的情况.例如:What do you think your brother will give you as your birthday present?
也有人把do you know 看成插入语,不过这样的话,上例就不好理解了.