----We're going for a picnic next Sunday, and I'd like you to join us.

---_______！I have to see my grandmother. She has been ill for two weeks.

A．What a pity

B．Good luck

C．That’s all right

D．Go ahead

用人单位发生合并或者分立等情况，原劳动合同（）

A、继续有效

B、失去效力

C、效力视情况而定

D、由用人单位决定是否有效