Perce Blackborow and his companions stayed on Elephant Island for six months bef
题型：不详难度：来源：
Perce Blackborow and his companions stayed on Elephant Island for six months before rescue came, so they ________ a lot of difficulties.| A．must go through | B．may go through | | C．must have gone through | D．could have gone through |
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答案
| C |
解析
| 考查情态动词。根据题意可知本句为对过去事情的推测，故用情态动词+ have done，根据句意可知must have done过去一定做某事，选C。 |
举一反三
With everything she _______, she went home.| A．needed to buy | B．needed buying | C．needed buy | D．needed bought |
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________anyone phone, tell them I’m in conference.| A．Would | B．Shall | C．Could | D．Should |
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If the dog hadn’t woken us, we wouldn’t have noticed the fire and it _______ to the house next door．| A．could spread | B．should have spread | | C．would spread | D．might have spread |
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| To my surprise, my good friend _________ stay up to study to prepare for the next important exams organized by ten famous high schools. |
Look at the mess the boys made! You _______ have taught them how to behave themselves.| A．must | B．may | C．can | D．should |
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