关于水平气压梯度力，下列说法正确的是[ ]

A．平行于等压线，指向高压区

B．垂直于等压线，指向高压区

C．平行于等压线，指向低压区

D．垂直于等压线，指向低压区

 With so much work____, don’t expect any holiday!

We will have to finish it soon.

A．doing

B．done

C．being done

D．to do