15．Why don’t you put the meat in the fridge？It will________fresh for several days.

A．be stayed　 B．stay

C．be staying　 D．have stayed

答案　B

解析　stay在此处是系动词，后加形容词作表语。该词用作系动词时，无被动语态和进行时。

14．I would appreciate it________you call back this afternoon for the doctor’s appointment.

A．until　 B．if　 C．when　 D．that

答案　B

解析　I would appreciate it if...是固定句型，表示“如果……，我将不胜感激”。

13．It is in Oxford University________he studied for 4 years________he got his graduate student degree.

A．that；that　 B．that；where

C．where；that　 D．where；when

答案　C

解析　第一个空所填的词在“he studied for 4 years”中作地点状语，故应用where；第二个空所填的词与前边的It is...构成强调句型。