"Oh,it is!" said Rabbit."Very uesful too,especially___you need help.横线上填什么单词?

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"Oh,it is!" said Rabbit."Very uesful too,especially___you need help.横线上填什么单词?
"Oh,it is!" said Rabbit."Very uesful too,especially___you need help.横线上填什么单词?

"Oh,it is!" said Rabbit."Very uesful too,especially___you need help.横线上填什么单词?
when 状语从句
Rabbit说它也是非常有用的,尤其是当你需要帮助的时候