They ________ to enter the building by the back door; however, the front door wa
题型：不详难度：来源：
They ________ to enter the building by the back door; however, the front door was locked.| A．are supposed | B．aren’t supposed | C．weren’t supposed | D．were supposed |
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答案
| C |
解析
| 考查短语：be supposed to do 应该做某事，根据后半句the front door was locked.，可知前半句也应用过去式，句意：他们不应该通过后门进入这个大楼，可是，前门锁上了。根据句意应选C。 |
举一反三
Professor Smith, along with his assistants, _________on the project day and night to meet the deadline.| A．work | B．working | C．is working | D．are working |
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Tom is the only one of the students who a scholarship since last year. | A．has won | B．have won | C．is winning | D．wins |
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— Not yet. But I the film is worth watching. | A．am told | B．was told | C．have told | D．have been told |
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If they ______ what I was saying, they’d know what I was talking about.| A．took the trouble to listen to | B．had trouble listening to | | C．take the trouble to listen to | D．have trouble listening to |
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