--The weather has been very hot and dry.

--Yes. If it had rained even a drop, things would be much better now! And my   vegetables   .

A．wouldn't die

B．didn't die

C．hadn't died

D．wouldn't have died

当主被叫开始通话以后，在H.248中MGC还会通知MG做哪些事情（）。

A.检测挂机

B.拍叉簧

C.放拨号音

D.放回铃音