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starlitcream 发表于 2013-1-3 20:28
125. Today, because of improvements in agriculturaltechnology, the same amount of acreage producesdo ...
这个Ron已经在论坛上明确表示,这是一个疏忽,新版的Manhattan会取消这个论断的。
原话是: One of the prime uses of helping verbs in parallel constructions is to express the same verb in a different tense. ... If you use "did/do/does/etc." to stand for an action verb, then it can be parallel to any tense of that action verb. |
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