题目内容
If nothing______, the oceans will turn into fish deserts.
| A．does | B．had been done | C．will do | D．is done |
D
解析试题分析：句意：如果没有什么可以做，海洋将会变成鱼的沙漠。因为主句是一般将来时，if引导的条件句用一般现在时代替一般将来时，所以选D。
考点：考查时态语态
Look! There is a whole crowd of people over there．Go and see what __________ and if it is a bargain，buy it．
| A．is selling | B．has been selling |
| C．is being sold | D．has been sold |
The number of foreign students attending Chinese universities rising steadily since1990.
| A．is | B．are | C．has been | D．have been |
— Isn’t it amazing that I met Francis at the Christmas party?
—Really?For how many years ____ each other?
| A．didn’t you see | B．haven’t you seen |
| C．hadn’t you seen | D．don’t you see |
Walmart，which is one of the largest American supermarket chains，________ some of its stores open 24 hours on Mondays through Saturdays.(2012·安徽)
| A．keeps | B．keep | C．have kept | D．had kept |
The discussion ________ alive when an interesting topic was brought in.
| A．was coming | B．had come |
| C．has come | D．came |
(2013·山东，27)—Oh no! We're too late.The train________.
— That's OK.We'll catch the next train to London.
| A．was leaving | B．had left |
| C．has left | D．has been leaving |
(2013·长沙高考模拟)I ________ him in time, otherwise he would have fallen off the bike.
| A．had supported | B．supported |
| C．have supported | D．support |
(2013·陕西高考)On Monday mornings it usually ________ me an hour to drive to work although the actual distance is only 20 miles.
| A．takes | B．is taking | C．took | D．will take |