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he began to write two hours ago. he have finished the article now

參考答案： He should have finished the article now.解釋：句子中的 "he began...

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bottom line basic line deadline bottom up

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we will do all we can to relieve the symptoms of the patients;that is our

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college students often complain that they only have little personal with the teaching staff after class

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NIST 云計算架構(gòu)參考模型定義了5種角色，以下不是的是：（）

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Space travel is dangerous and the astronaute in space have to many discomforts in their rockets