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