有个英语问题 我无法理解麻烦各位高手给于帮助谢谢大家
Oilrigshavetoberepairedfrequentlyanddivers,whooftenhavetoworkindarknessahundredfeetun...
Oil rigs have to be repaired frequently and divers,who often have to work in darkness a hundred feet under water,have been frightened out of their wits by giant fish bumping into them as they work. 为什么这里用现在完成式
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