问题补充：
Toms mother kept telling him that he should work harder, but didn help．
A. he
B. which
C. it
D. one
答案：
A. he
B. which
(答案→)C. it
D. one
解析：句意：汤姆的妈妈一直告诉他他应该更加努力学习，但那没用。从题目中可以看出这是并列句，it指代Toms mother kept telling him that he should work harder.整句话。所以选A。
考点: 考查代词的用法。
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