— I don't know_   .

— You can go and ask Jack.

A．when does the train leave

B．that we will plant trees or not

C．if she had come yesterday

D．what I should buy for him

无牙颌患者的软组织改变，不包括

A．唇颊沟及舌沟间隙变浅
B．鼻唇沟加深
C．口角下陷
D．舌体变大
E．黏膜增厚