C．would rather not have joined

　　D．would like to have joined

　　答案　C

　　解析　考查虚拟语气和情态动词。表示与过去事实相反，故选C。

　　5．Remember ________ the lights when you leave the house.

　　A．to turn off B．turning off

　　C．to turn on D．turning on

　　答案　A

　　解析　考查remember后加动名词和不定式之间的区别。remember to do sth记住做某事。remember doing sth记得做过某事。

　　6．Taobao is Asia's largest retail(零售的)network platform，________ people can buy and sell many kinds of things.

　　A．where B．when

　　C．that D．whose

　　答案　A

　　解析　考查定语从句。where在从句中作地点状语。

　　7．-I'm not feeling very well，Barton. To tell you the truth，I'm tired of the present life.

　　-I suggest you do some ________ exercise to keep fit.

　　A．normal B．general

　　C．common D．regular

答案　D