—I thought you ______ for vacation tomorrow.

—I had planned to, but I have a very important meeting to attend tomorrow.

A．will leave

B．are leaving

C．have left

D．were leaving

渤海海域主要开发油气田的地层水为（）水型。

A、硫酸钠

B、氯化镁

C、重碳酸钠

D、不确定