－Would you like to join us in the game?

－________, for I have something important to do.

A．I will

B．I’d love to

C．I won’t

D．I’m afraid not

已知△ABC与△A′B′C′中，AC=A′C′，BC=B′C′，∠BAC=∠B′A′C′=110°

（1）试证明△ABC≌△A′B′C′．

（2）若将条件改为AC=A′C′，BC=B′C′，∠BAC=∠B′A′C′=70°，结论是否成立？为什么？