她不可能一个晚上就写完这份作业——通常需要整整一周。
She couldn't have finished the assignment in one evening — it normally takes a full week.
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couldn't英 /ˈkʊdnt/|美 /ˈkʊdnt/
have英 /əv/|美 /əv/
finished英 /ˈfɪnɪʃt/|美 /ˈfɪnɪʃt/
解释
couldn't have finished 表示对过去完成的否定推测——正常用时与声称用时的巨大差距说明一晚写完不可能。
She couldn't have finished the assignment in one evening — it normally takes a full week.
couldn't have finished 表示对过去完成的否定推测——正常用时与声称用时的巨大差距说明一晚写完不可能。