问题
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;
B:can’t
C:shouldn’t
D:needn’t;
正确答案是：
同类题型
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