题目
题型：不详难度：来源：
Every possible means ____, but none ____ successful．
| A．has tried; has proved | B．tried; proves |
| C．has been tried; proves | D．is being tried; is proved |
答案
解析
核心考点
试题【Every possible means ____, but none ____ successful．A．has tried; has provedB．tri】；主要考察你对一般现在时等知识点的理解。[详细]
举一反三
.More patients ＿＿ in hospital this year than last year.
| A．treated | B．have treated | C．had been treated | D．have been treated |
.After a fire broke out in the lab, a lot of equipment＿＿.
| A．is damaged | B．had damaged | C．Damaged | D．was damaged |
.Great changes______in the city and a lot of factories______.
| A．have been taken place…have been set up | B．have taken place…have been set up |
| C．have taken place…have set up | D．were taken place…were s et up |
.This is Ted’s phone. We miss him a lot. He ___ trying to save a child in the earthquake.
| A．killed | B．is killed | C．was killed | D．was killing |
.The manager entered the office and was happy to learn that four-fifths of the tickets ___.
| A．was booked | B．had been booked | C．were booked | D．have been booked |
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