The biggest problem for most plants, which ______ just get up and run away when threatened, i
s that animals like to eat them．
| A．can’t | B．shan’t |
| C．needn’t | D．mustn’t |
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The biggest problem for most plants, which ______ just get up and run away when threatened, is that animals like to eat them．
| A．can’t | B．shan’t |
| C．needn’t | D．mustn’t |
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