问题
选择题
Tom's mother kept telling him that he should work harder，but ________ didn't help.
A．he
B．which
C．it
D．none
答案
答案：C
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't help意为“没有，不奏效”。it指代前面的内容。
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