问题补充：
Toms mother kept telling him that he should work harder，but didn help.
A. he
B. which
C. it
D. none
答案：
A. he
B. which
(答案→)C. it
D. none
解析：句意：汤姆的母亲不断地告诉他应该更加努力地学习，可是没用。此处it didn help意为“没有，不奏效”。it指代前面的内容。
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