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第1题

They are sure they have all the facts they need to ____ the existence of a black hole. A) obtain B) maintain C
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第2题

Tryon was extremely angry, but cool-headed enough to ____ storming into the boss’s office. A) prevent B) prohibit
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第3题

___ quite recently, most mothers in Britain did not take paid work outside the home. A) Before B) Until C) From
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第4题

I couldn’t find ____ , and so I took this one. A) a large enough coat B) an enough large coat C) a large co
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