1 选B
NEEDNOT 是不必的意思,而MUSTNOT是禁止,不能够的意思
2 选C 句型是spend sometime doing something ,pick up 捡起
take up 占据 占用
put up 举起
send up 提出
3 选B 表示将来比较快~!
A C D 都是快的意思,A 用来形容动作很快 ,副词
C用来形容快,既可以当副词,也可以当形容词
1.Be careful,children!You______step on the grass.
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