结构清晰,develop...but do not grow to be ....正确
注意比较对象的平行
并列对象是: native North American grasses develop...... but do not.....
比较对象正确 并且but前后平行一致
还是逻辑主语的问题,NAG develop xxx, allowing for(考虑到),but do not xxx。 但是B中,就算allow是允许的意思,那么which修饰 system 后面的 without going to be 的主语也很奇怪 到底是system 还是 NAG (可能就是which 夹心修饰了)
grasses develop... but do not grow...平行
but 后的主语是Native North American,与主句相同所以可以省略
grow to be tall, 只能是再说grasses,如果用but w/o growing to be,其逻辑主语则含混不清。
Allow for 是考虑到的意思,可以作为插入语? 并列对象是: native North American grasses develop...... but do not.....
native North American grasses develop ...,but do not grow...
native North American grasses 后跟 动词平行develop ... but do not grow...
并列对象是: native North American grasses develop...... but do not.....
把网站装进口袋
随时随地练习