下列没有歧义的一句是( )。

A．这个发言稿是新来的市长的秘书写的

B．他在树上爬上爬下，轻捷得像只猴子

C．小张下班后一到家就朝着妻子嚷嚷：“我现在就要热饭。”

D．他已经走了半个多小时了

----Look! ________a high probability that their team will win.

----Yes, the members are cooperating so well.

A．It is

B．It was

C．There was

D．There is