问题补充：
We should learn from those are always ready to help others.
A. who
B. whom
C. they
D. that
答案：
(答案→)A. who
B. whom
C. they
D. that
解析：考查从句，从句are always ready to help others缺少主语，所以用who，whom只作宾语，所以选A
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