问题补充：
As teachers we should concern ourselves with what is said,not what we think ( ).A. ought to be said B. must say C. have to be said D. need to say 为什么选A,不选C?是不是应为has to be said?
答案：
a是应该说c是不得不说
======以下答案可供参考======
供参考答案1:
ought to 表应该
have to表不得不
供参考答案2:
a
