--- 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 |
--- 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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