()烟草专卖行政处罚案件中，执法人员询问证人时制作的询问笔录属于当事人陈述，是重要的证据。
参考答案：错
When he is free, he often helps his parents ________ some housework.
A．does
B．do
C．doing
D．did
电信企业在促销活动中必须遵循哪些原则?
