esearch 被动begin:that once (省略了the research is) begun nothing can be done to change it.
The reserch is so designed that once ___ nothing can be done
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The missile is designed so that once____nothing can be done
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The research is so designed that once _______nothing can be
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The research is so designed that once ______ nothing can be
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The research is so designed that once________nothing can be
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The research is so designed that once begun nothing can be d
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The research is so designed that once ___（begin ）nothing can
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The research is so designed that once ________ nothing can b
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1.This missile is designed so that once ___ nothing can be d
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this missile is designed so that once fired nothing can be d
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there is nothing ______ can be done by us.