_________ you take an active part in physical activity ______ be able to keep fi
题型：不详难度：来源：
_________ you take an active part in physical activity ______ be able to keep fit and stay healthy.| A．Only if; you will | B．Only if; will you | | C．Unless; you will | D．Unless; will you |
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答案
| B |
解析
试题分析：考查倒装句：句意：只有你积极的参加体育活动，你才能保持健康。Only后面接状语从句的时候，主句应该用部分倒装，助动词will放在主语前面，选B。 |
举一反三
Not until he left his home _____ to know how important the family was for him. | A．did he begin | B．had he begun | | C．that he began | D．he had begun |
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| Strange as it might be, the suggestion he made we make good use of the equipment is acceptable. |
Only after Mary read her essay the second time the spelling mistake.| A．did she notice. | B．she notice. | | C．does she notice | D．she has noticed |
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As is known to us all, under no circumstances______ temporary economic development at the expense of the environment and resources.| A．should we seek | B．we should seek | | C．we had sought | D．had we sought |
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Though ____ the dangers of smoking to their health, smokers still find it hard to give up smoking.| A．aware | B．aware of | C．are aware of | D．be aware of |
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