The biggest problem for most plants, whi...

The biggest problem for most plants, which ________just get up and run away when threatened, is that animals like to eat them.

A. shall not B. can't

C. needn't D. mustn't

B 【解析】试题分析：句意：对多数植物来说，面对威胁时不能马上起来跑开的最大问题是动物喜欢吃他们。which ________just get up and run away when threatened是定语从句，修饰problem..根据句意此处为“不能”，故选B. 考点：考查情态动词。

考点分析：

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