- Why was Professor Johnson unhappy those days? - Can’t you see it clearly? The

 — Why was ProfessorJohnson unhappy those days?

— Can’t you see it clearly? The only reason was that the theory hestuck to________ wrong.

A.proving                               B.being proved    

C. proved                           D.was proved

试题答案

【答案】

 C. 用过去时态，无被动。