Zhang Yining has trained continuously for six hours. she is tired out.
A. There is no wonder
B. There is no need
C. It’s no wonder
D. It’s no doubt
网友回答
A. There is no wonder
B. There is no need
(答案→)C. It’s no wonder
D. It’s no doubt
解析：考查固定句型。There is no need doing sth.“没有这么说的必要”；It’s no wonder that...“难怪......”。句意“张怡宁已经连续训练六个小时了。难怪她很累。”故选C。