七 . 逗号用于两个并列单句之间,且逗号后面须接连词。如:
9. Toms mother kept telling him that he should work harder, but _______ didnt help.
A. he B. which C. she D. it
析:答案为 D 项。 but 连接两个并列的句子,其后面的句子缺少主语,故选 it ,指代前面已被提及过的同一事物。
河南 刘新会
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