All but one _____ take part in the conference ＿＿ tomorrow.

A．is going to that is to take place

B．are going to that is about to take place

C．are going to that is to be taken place

D．are going to； which is to be held

下列水系中，水能蕴藏量最大的是[ ]

A．长江水系

B．黄河水系

C．珠江水系

D．黑龙江水系