--Have you turned off the light?—Sorry, I ___ all about it.

A．have forgotten

B．forgot

C．had forgotten

D．would forget

以硅胶为固定相的薄层色谱按作用机制属于

A．吸附色谱

B．离子交换色谱

C．胶束色谱

D．分子排阻色谱

E．亲合色谱