He had to___ before they finished the course because they were not well discipli
题型：不详难度：来源：
He had to___ before they finished the course because they were not well disciplined.| A．drop in | B．drop out | C．drop off | D．drop by |
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答案
| B |
解析
| 这里的短语意思各不相同，drop out 退学,drop in /drop by 顺便拜访，drop off 下降，减少。 |
举一反三
Plastic and rubber won"t _________ electricity,but copper will.| A．have | B．do | C．pass | D．conduct |
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Arguments happen when people _________ each other"s views.| A．go against | B．go for | C．keep | D．have |
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It wasn’t ________ they found that there was much trouble ________ the plan.| A．long before; to carry out | B．long before; carrying out | | C．before long; with carry out | D．before long; in carrying out |
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| The conference has been held to discuss the effects of tourism _______ the wildlife in the area. |
_____, I don"t like her sister.| A．Telling the truth | B．Been told the truth | | C．To tell the truth | D．To tell the true |
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