It was not until man had learned how to make iron and steel that the constructionof various machines _ possible.A.were madeB.had madeC.madeD.was made请老师帮我仔细划分句子成分再逐一给四个选项解答,最后在详细说明not until的用法,谢谢。
... that our noses are limited to perceiving
those smells which float through the air, ... 我的理解是宾语从句中are limited to perceiving为谓语,those smells为宾语。实义动词为perceive。疑问:可不可以根据SVA句式,将are limited 作为谓语,to perceiving those smells...
Wal-Mart says it's working with consumer-product manufacturers to trim
their packaging and will reward those that do so with prime real estate on the
shelves.请问这句活后半段该如何理解呢,do so with 是表“这样做..."的意思吗
Do you remember all those years when scientists argued that smoking would kill us but the doubters insisted that we didn't know for sure?这句话并不缺成分,为什么when引导的是定语从句而不是时间状语从句?