问题
单项选择题
Tom's mother always told him not to smoke again, but （）didn't help.
A．he
B．it
C．which
D．as
答案
参考答案：B
解析：
it指前面提到的Tom's mother always told him not to smoke again。故选B。
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Tom's mother always told him not to smoke again, but （）didn't help.
A．he
B．it
C．which
D．as
参考答案：B
解析：
it指前面提到的Tom's mother always told him not to smoke again。故选B。