most U.S. economic activity. 語法怎麽解釋?
所有跟帖:
• almost all/the majority of U.S. economic activity -EnLearner- ♀ (1167 bytes) () 09/04/2011 postreply 07:34:04
• 我昨天也納悶兒呢!activity是可數的啊。 -i999- ♀ (0 bytes) () 09/04/2011 postreply 09:21:39
• 有時可數,有時不可數。 -EnLearner- ♀ (1371 bytes) () 09/04/2011 postreply 11:32:13