问题补充：
“Sorry” is the hardest word to say sometimes. you know you’ve done something wrong, or something inappropriate, it takes courage to say sorry.
A. Only if
B. Even if
C. If only
D. As if
答案：
A. Only if
(答案→)B. Even if
C. If only
D. As if
解析：A. Only if只有如果，B. Even if即使，C. If only但愿，D. As if好像，句意：有时“对不起”是最难说的话，即使你知道你做错了或做的不适合的事情，说抱歉也需要勇气的。选B。
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