Whoever leaves the room last must ______ that all the lights are turned off.A．is
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Whoever leaves the room last must ______ that all the lights are turned off.| A．is sure | B．make sure | C．find out | D．look out |
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答案
| B |
解析
| 短语必须。B确定；C发现，查明；D当心；A项不能放在must的后面。句意：任何一个最后离开房间的人必须确定所有的灯都被关闭了。根据句意说明B正确。 |
举一反三
The little boy is dirty from head to foot because he ___ in the mud all morning. | A．has played | B．is playing | C．has been playing | D．was playing |
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The engine of the ship was out of order and the bad weather________ the helplessness of the crew at sea.| A．added to | B．resulted from | C．turned out | D．made up |
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She to beat the world record but failed at last.| A．succeeded | B．attempted | C．advised | D．offered |
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—Sleep well last night?
—Far from that! My next-door neighbor music pretty loud.| A．plays | B．had played | C．would play | D．was playing |
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How much does that ?| A．add | B．add up | C．add to | D．add up to |
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