________ with a slow economic situation overseas，more Chinese students are returning home after studying abroad, ________ to work in the country or in west China.

A．Having faced；to volunteer

B．To face；to volunteer

C．Facing；volunteering

D．Faced；volunteering

游客是上帝，导游人员尊重游客的最好办法，就是时时处处为游客着想，自觉维护游客的合法权益，这是保障旅游团队行程顺利、旅途愉快的前提