The rescue team must have searched for th
The rescue team must have searched for theThe rescue team must have searched for the missing visitors two days ago,_______? A.mustn't they B.haven't they C.didn't they D.hadn't they
含有must have done结构的句子中如果有明确的过去时间时,附加疑问句中的助动词常用did. 选择C
C.didn't they 因为有时间状语 two days ago,___ 所以是对过去的猜测,用一般过去时态助动词就可以。
答:亲爱的 一般的搜索详情>>
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>>