Question

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

Answer 1

B

解析:

句意：对大多数植物来说，当受到威胁时竟不能站起来并逃走，因此，经常会被动物吃掉是他们面临的最严重问题。显然，B项正确。