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定语从句。根据后面的逗号可知，此处为非限制性定语从句，放句首的只能选择as
__________ has already been pointed out, grammar is not a se
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_______ has already been pointed out,grammar is not a set of
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_____ has already been pointed out, grammar is not a set of
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As has already been pointed out,grammar is not a set of dead
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______ has already been pointed out, only by correcting mist
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______ has already been pointed out, only by correcting mist
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______ has already been pointed out, only by correcting mist
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________ has already been pointed out, only by correcting mi
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As has been said above,grammar is not a set of dead rules.
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1.As has been pointed out,his suggestion is so good that it
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It may not seem much consolation to point out能否It may not se