题目信息
Since the beginning of the year, the community medical clinic verified rigorously the potency of each flu vaccine sample, lest any of its patients are vulnerable to the flu.
A:verified rigorously the potency of each flu vaccine sample, lest any of its patients are
B:rigorously verified the potency of each flu vaccine sample, lest any of its patients would be
C:is rigorously verifying the potency of each flu vaccine sample, lest any of its patients not be
D:rigorously has verified the potency of each flu vaccine sample, lest any of its patients are
E:has verified rigorously the potency of each flu vaccine sample, lest any of its patients be
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E:has verified rigorously the potency of each flu vaccine sample, lest any of its patients be
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Magoosh
