还是应该填Why
it really is a proof of just how much money you have paid in advance for mail delivery
这是个完整的句子.
你用what的话,从句中必定缺少成分需要what去替代.
还是应该填Why
it really is a proof of just how much money you have paid in advance for mail delivery
这是个完整的句子.
你用what的话,从句中必定缺少成分需要what去替代.