Nobody knows how people first came to these islands. They _____ from South Ameri
题型：不详难度：来源：
Nobody knows how people first came to these islands. They _____ from South America on rafts.
A .must have sailed
| B. can sail
| C. might have sailed
| D. should have sailed
|
|
答案
| C |
解析
| 考察虚拟语气。根据上文，没有人知道人们第一次是怎么到达这些岛上的。可知下文猜测的事情发生在过去以前，故需用过去完成时态。Must表示必须、一定；might表示可能；should表示应该。根据上文可知不是很确定，故选C，他们可能成木筏从南美洲过来。 |
举一反三
I sooner but I didn’t know that they were waiting for me.| A．had come | B．was coming | C．would come | D．would have come |
|
| The sign reading "No Photos" means that no one ____ take any photos in the Palace Museum. |
| If you __ go, at least wait until the storm is over． |
I ________ asleep because it took me a long time to realize that the telephone was ringing. | A．could fall | B．need have fallen | C．must have fallen | D．may fall |
|
—I failed again. I wish I _________ harder.
—But you _________.| A．had worked; hadn’t | B．worked; don’t | | C．had worked; didn’t | D．worked; didn’t |
|
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