—How long on earth shall I have to wait?
—Sorry, sir. Just a minute. There a table available.
A. is
B. was
C. will be
D. has been
网友回答
A. is
B. was
(答案→)C. will be
D. has been
解析：C 考察动词时态。句义：我究竟要等多长时间？对不起，先生！再等一会，马上就有空桌子了。由语境可知，此处应该使用将来时，表示将要有张桌子。故C正确。