问题
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However, where immediate action is necessary to ensure safety of the ship, its machinery and crew, it must be taken by the engineer in chargeWhat dose “it” mean in the sentence above?
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Care must be taken to condition the ______ in the boiler to prevent scaling, and corrosion
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The thing you wash your hair with must be________. 查
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Care must be taken in using this method lest overflow______.A.should occurB.occursC.occurr
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Writing is not an easy skill. It is both mental and physical. A person must be able to mov
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The thing you wash your hair with must be______.A