sally has been swimming _____four hours 1.for about 2.since 3.about 4.in

sally has been swimming _____four hours 1.for about 2.since 3.about 4.in 英语翻译3.2 Rule-Based Inference ModuleA rule-based inference module has been developed based on the visual criteria listed in the previous section.These criteria are further summarized into the following rules to detect a possible drowning swimm Sally is looking for a new job.She has been bored ______ her job as a secretary.选什么?为什么 1)Sally has been in China for 10 years ,so she ____(has got used to ,has used to )the Chinese food. has been sally has always has always been Sally has some books.(对som books提问)—— —— Sally —— 用 have / has been to,have / has gone to 或have / has been in 填空.Where （） you （）?I have waited for you for a long time.Mike （） America several times.14.--- Sally and Tim are on holiday,aren't they?Where （） they （）?--- To Flo has been anything taken. Where has she been? has been replaced How has China been? Has been very quiet Everything has been achanged Has been forward life has been good china has been free -