—— It's no easy task to catch a ticket on a website that receives l billion clicks daily．
一一I can’t agree with you more．There be errors for every single step
A. should
B. must
C. can
D. will
网友回答
A. should
B. must
(答案→)C. can
D. will
解析：考查情态动词。句义：我再同意不过了。每一步都有可能出错。Should 应该，竟然，万一，must 必须，一定 can 能够，可能 will将，，本句表猜测，should按道理应该，must一定，有把握的肯定猜测，will不表猜测，所以排除Ａ Ｂ Ｄ，will 表猜测，表客观可能性，所以C正确。