Tea wasn't introduced into Europe until the early 17th century. And now it has _______ popular in Europe and America.这道题给的答案是become，请问可不可以用been呢？如果不行，为什么呢？
...od that we can be transported from long distances and stored until we need it, first in the supermarket, and then at home.这句话里的we can be transported的被动语态为什么要用在we上啊？不是应该用在packaged or canned food上吗？
句子：If you don’t like the drink you ordered just leave it and try a different one.在这个句子中，one 是指代 drink 吗？但问题是，drink 是不可数名词，那就是说 one 可以指代不可数名词，但这又是与语法书上的说法相违背的。这是为什么？
He also liked to try to place it into the slot. Because of his tender age and incomplete understanding of the need to position the key just so, he would usually fail.请问老师，句中 just so 是什么结构，想要传递什么含义？其次，to position the key just so 是the need 的...
This is not because a person arrives his natural limit of efficiency when he reaches the sixth grade,for it has been shown again and again that with special tuition so many older children,and also adults,can make enormous improvement.
牛津词典例句:For all its clarity of style, the book is not easy reading. 这本书虽然文体清晰，但读起来并不容易。为什么后面是easy reading 呢？这是主动表被动吗？如果是，为什么不是easy to read呢？麻烦老师对easy reading 从主动表被动和d...