问题补充：
Tom’s mother kept telling him that he should work harder, but didn’t help.
A. he
B. it
C. she
D. which
答案：
A. he
(答案→)B. it
C. she
D. which
解析：考查代词it，由转折连词but，可以知道不是从句，是个简单句，句子意思“汤姆的妈妈一直告诉他应该工作刻苦，但是这没有帮助他”
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