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--- It’s reported that vaccines(疫苗) for H7N9 bird flu may hit the market as early as May. --- Really...
题目内容：
--- It’s reported that vaccines(疫苗) for H7N9 bird flu may hit the market as early as May.
--- Really? If so, we _____ depend on those from abroad.
A. mustn’t B. can’t C. shouldn’t D. needn’t
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