我看到有人把题po上去了。有童鞋确认一下这道题选啥吗?谢!!!!应该有if 吧?if boil too long and you end up with maple suger? Open to discuss~
Maple syrup 的制成需要两不 firstly sap collected from maple 如何如何,secondly,to boil the sap to exactly 291 Fereheihte, boiling too long and you end up with maple sugar. 选项主要集中在firstly 跟secondly 后面的平行,另外有选项把 secondly,换成了and then 还有个选项区别在最后的那个boil ,有一个是 Fereheite—boil ,还有一个是 Fereheite, and if boiling