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Carefully read the paragraph below:
__________, medicine has been operated by trial and error, in other words, __________. We know by now that there can be entirely_________ connections between symptoms and treatment, and some medications succeed in medical trials for mere random reasons.
From the options below, choose the one that MOST appropriately fills up the blanks.
The first blank requires a word that refers to the events of the past; the best-suited word is "historically".
In the second blank, we need a word that goes with the idea of random choices; here, both "random" and "arbitrarily" are well suited.
The third blank requires a word that means by chance or luck, "fortuitous" is the best fit here.
Hence the correct choice is E.
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