题目

He paid for a seat, when he      free.     A．should have entered          B．could have entered        C．could enter                  D．would enter   答案：B  考查虚拟语气。句意：他买了票，可他本能免费进入的。  My pensal __       Singapore.   [     ]A. from              B. is from   C. come from          D. are from