Ⅲ.句型搜索 1.I'm allowed to stick one in only if I've been in a place for more than 24 hours.
[信息提取] 句中only if为常见的固定结构,意为“只有”,引导条件状语从句。 [例句仿写] 只有你答应保守秘密我们才会把我们的计划告诉你。 We'll tell you our plan _____________________________. 答案 only if you promise to keep it a secret