(2011·安徽芜湖调研)if human beings had been a bit less greedy and cruel，more birds and animals________dying out.
a．ought to avoid b．could have been avoided
c．should have avoided d．might have avoided
解析： 句意为：如果人类少点贪婪少点残忍，更多的鸟类和动物就有可能免于灭绝。这里考查的是对过去情况的假设，从句用had done，主句用would/could/might have done。avoid “避免”，其后接doing 时没有被动语态。
答案： d
3．(2011·哈尔滨检测)________anyone call，please tell him i’m not free.
a．must b．can
c．may资源难易程度:★★★★★★★★★★★★★★★
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