---I don’t know how to write the article assigned by our professor on international trade.

--You should have ______ your attention on the lecture that ______ how international situation affects exports and imports across the globe.

---I don’t know how to write the article assigned by our professor on international trade.

   --You should have ______ your attention on the lecture that ______ how international situation affects exports and imports across the globe.

    A. put; concentrate on    B. paid; talked about    

C. fixed; dealt on        D. focused; focused on

---I don’t know how to write the article assigned by our professor on international trade.

　 --You should have ______ your attention on the lecture that ______ how international situation affects exports and imports across the globe.

　 A. put; concentrate on　 B. paid; talked about　　

C. fixed; dealt on　　　 D. focused; focused on

---I don’t know how to write the article assigned by our professor on international trade.
--You should have ______ your attention on the lecture that ______ how international situation affects exports and imports across the globe.