题目

Tom’s mother always told him not to smoke again, but _____ didn’t help. A. he                                                        B. it C. which                                                  D. as 答案：B 解析: it 指前面提到的情况。由于句中用了并列连词 but，所以不能选C。当然，若去掉空格前的but，则可选C。

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