请教急急
The teacher with the students___on the farm at this time yesterday. 1 worked 2 was working 3 work 4 were working 应选哪个为什么?
答:absolutely right. a 和an的区别: a用于辅音(音标)开头的词前,而不是辅音字母。an用于元音(音标)开头的词前,而不是指元音字母。 例: ...详情>>
答:B 被动语态,be found to do. A中的made与found均为过去分词,冲突!详情>>
问:hArd work 和hArd--working有什么区别
答:一个是名词 一个是形容词撒详情>>