—Hi, Mr. Smith. Which department do you work in?

—I am in the Marketing Department now, but I ________ in the Sales Department before long.

A．worked

B．will work

C．have worked

D．will have worked

由下图所示实验得出的结论中，不正确的是

A、                   B、                 C、                 D、

A．化学反应中有能量变化

B．水是由氢气和氧气组成的

C．红热的铁丝在氧气中能发生燃烧

D．二氧化碳不支持燃烧，密度大于空气