21. John plays basketball well, ___his favorite sport is badminton.
A. so B. or C. yet D. for
【答案】C。
【解析】考查连词的用法。约翰篮球打的好，然而他最喜欢的运动却是羽毛球。用yet表示转折。
22. You may use the room as you like ___ you clean it up afterwards.
A. so far as B. so long as C. in case D. even if
【答案】B.
【解析】考查状语从句的用法。该句话的意思是：只要你后来把房子打扫干净，你就可以按照你喜欢的方式使用这间房子。as long as =so long as只要。
23. Scientists have many theories about how the universe ___ into being.
A. came B. was coming
C. had come D. would come
【答案】A。
【解析】考查时态的用法。宇宙是如何形成的，因为宇宙的形成这个动作已经发生，所以用一般过去时来表示已经发生的动作。
