—I knocked but nobody answered the door. ----They _____asleep then and didn’t he
题型：不详难度：来源：
—I knocked but nobody answered the door.
----They _____asleep then and didn’t hear you.| A．must be | B．should be | C．must have been | D．should have been |
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答案
| C |
解析
| 考察虚拟语气.句意:我敲门但是没有人开门._那时候他们一定是已经睡着了,没有听到你敲门. “must+have+done”表示对过去事情的肯定推测，译成“一定做过某事”故选C. |
举一反三
--- ____ Miss Ann stay out or be shown in , sir ?
---- Wait out a moment , please . |
So long as there are more people than needed , there _____ be tests to help make a fairer decision . | A． shall | B．must | C．may | D．can |
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He proposed that we _______ a meeting , which suggested he ________ in our plan .| A．held; was interested | B．hold; was interested | | C．should hold ; be interested | D．should hold ; interested |
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He ___________ the test, but he wasn’t careful enough.| A．was able to pass | B．must have passed | C．could have passed | D．might be able to pass |
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The World Health Organization warned that Asian countries __________ attentive to bird flu since Asia ___________ got rid of the disease completely.| A．should keep; has | B．must remain; has not | C．ought to stay; has been | D．shall be; has not been |
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