3.An expert, together with some assistants, ____ to help in this work. A. was sent B. were sent C. is sending D. are sending翻译

an expert on losing an expert on和be expert in的区别 an expert in/at/on/with有什么区别?例子：1.an expert in/at teaching small children意思就是说an expert in和an expert at通用对吗?2.an expert in economics3.an expert on foreign affairs4.an expert with the needles 是be an expert in/at/on ,还是be expert in/at/on? 请帮忙翻译：He is an expert in sign language. sales.he is an expert and maketing英文翻译 an expert in/on/at有什么区别 a specialist or an expert in genetics（a noun） pray togethe是什么意思 3.An expert, together with some assistants, ____ to help in this work. A. was sent B. were sent C. is sending D. are sending翻译 This life is togethe是什么意思? he considers himself an expert on the subject 我认为是 he considers himself is an expert on the subject 我是按照中文翻译的就是这样?语法新手. 麻烦看下这三个句子有没有语法错误Can I put you forward to club secretary?Linda is an agricultural expert.Linda is an expert in agriculture. become an expert at 与become expert at 与在新概念第二册的Lesson 59与Lesson 94中出现了,Rex soon became an expert at opening the gate与children become expert at holding their breath under water even before they can walk.其中expert前 the old man is a expert 这里是a还是an? 英语翻译Even from an expert whose counsel has endured for centuries,this is a bold claim! an expert----- to help them tomrrow,they are sure to work out the problem It seems as if he were an expert 为什么谓语动词要用were 而不是was