[文法] help

[Lasek (猴子)]

1.Do you have a contact number that I can phone you at?
我對後面的at不是很懂..請問句末什麼時後要加介係詞?

2."比你所知道的還多"可以翻成more than what you know媽?
  如果不可以的話那為什麼不行呢?
 (我知道more than you know好像可以)

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