He promised to help me and then_________.A．back outB．backed outC．backed ofD．back
题型：不详难度：来源：
He promised to help me and then_________.| A．back out | B．backed out | C．backed of | D．backed on |
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答案
| B |
解析
| 词义辨析。back out不遵守诺言；backed of在……后边；backed on背靠。句意：他许诺了帮助我，然后又反悔了。根据句子谓语promised，所以用一般过去时，选B。 |
举一反三
The young man was______.| A．addicted to drinking | B．addicted to drink | | C．addicted on drinking. | D．addicted in drinking |
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— Have you heard that he was admitted into Beijing University?
— Is that true? I’m glad that his efforts at last ______. | A．worked out | B．paid off | C．turned out | D．paid for |
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There is such a problem _________ we all should _________.| A．as; pay attention to it | B．that; attract our attention | | C．as; pay attention to | D．that; attract our attention to it |
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You must trust him; he is a man who _________ his promise.| A．speaks out | B．lives up to | C．depends on | D．keeps on |
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Almost all of his time ______ experiments, he has no time to visit his parents.| A．devoted to do | B．devoted to doing | | C．devoting to doing | D．is devoted to doing |
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