指出下面词语或诗句中画线字的正确解释，将序号写在括号里。 

此起彼落 

[ ]

A．那，那个    

B．对方，他

I don’t know if Mr Green ________. If he ______, I will let you know.

A．comes--- will come

B．will come--- comes

C．will come--- will come

D．comes--- comes