In Text I, the word do in the fragments: “when they do occur" (line 38); “they do not risk being faced" (lines 43-44) and “workers must do their job" (line 47) respectively, fulfill the role of
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A emphasis, auxiliary verb and main verb
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B auxiliary in the two first instances and modal in the third
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C modal, main verb and auxiliary verb
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D main verb, emphasis and modal
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E auxiliary, modal and emphasis