13.Many medical scientists are racing__________time to find a cure for H1N1 as soon as possible.A.on

题目简介

13.Many medical scientists are racing__________time to find a cure for H1N1 as soon as possible.A.on

题目详情


13.Many medical scientists are racing__________time to find a cure for H1N1 as soon as possible.
A.onB.againstC.forD.In
题型:单选题难度:偏易来源:不详

答案

B

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