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Middle and primary school students were the first to get the

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Middle and primary school students were the first to get the A/H1N1 flu vaccine shot(甲型流感疫苗注射).This is because it is easier_____them to get sick
A.to B.at C.for D.of
Middle and primary school students were the first to get the
Middle and primary school students were the first to get the A/H1N1 flu vaccine shot(甲型流感疫苗注射).This is because it is easier__for_them to get sick(对于他们来说).