You’d better not call me up between 7 and 8 this evening, for I ____ an important meeting then.

A．will have

B．am having

C．will be having

D．will have had

杆AF、BE、EF相互铰接并支承，如图所示。今在AF杆上作用一力偶（P、P′），若不计各杆自重，则A支座反力的作用线应（）

A.过A点平行力P

B.过A点平行BG连线

C.沿AG直线

D.沿AH直线