Could you tell me _____________ ?

A．what she had done with the newspaper

B．what the matter is with him

C．which is the way to the nearest hospital

D．which gate I should go

如果法律和当事人双方对合同的形成程序均没有特殊要求时，( )日合同成立。

A．承诺生效

B．要约生效

C．附生效期限的合同期限界

D．双方当事人签字或者盖章