问题补充：
As teachers we should concern with what is said, not what we think.
A. have to be said
B. must say
C. ought to be said
D. need to say
答案：
A. have to be said
B. must say
(答案→)C. ought to be said
D. need to say
解析：可联系答.案.网客服索取。
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