most U.S. economic activity. 语法怎么解释?
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almost all/the majority of U.S. economic activity
-EnLearner-
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09/04/2011 postreply
07:34:04
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我昨天也纳闷儿呢!activity是可数的啊。
-i999-
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09/04/2011 postreply
09:21:39
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有时可数,有时不可数。
-EnLearner-
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(1371 bytes)
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09/04/2011 postreply
11:32:13