请教一道英语语法题last year,he became _____teacher and his friend turned ___doctor.第一个空肯定是a 了,但是为什么第二个正确答案什么都不填呢?职业前不是要有冠词么?

请教一道英语语法题last year,he became _____teacher and his friend turned ___doctor.第一个空肯定是a 了,但是为什么第二个正确答案什么都不填呢?职业前不是要有冠词么? 请教一道改错题：she gave him it last night. 一道基本的英语语法题When he was here last year,our new library ________ .A.was buildingB.has been builtC.was being builtD.was to built请问其他几个选项为什么是错的? 一道英语语法单选题:Last year, said the spokesman, we _______ out 5 million yuan in insurance claim A.have paid.B.paid .为什么选B? 我想问一道英语题is this research center______you visited the modern equipment last year? 请教一个英语语法使用问题,These machines are better than___we turned out last year.这里为什么用Those而不用Which?These machines are better than which we turned out last year.这样感觉读的也很顺呀,为什么不能用呢? 请教英语试题一道Every year a lot of babies_______ born. last year 高中英语语法题The highwat( ) last year is in use now.a.built b.having been builtc.being built d.to be built mr.chen,my math teacher last year,has retired是什么英语语法 请教一道几何题 请教一道线性代数题 The two girls got very ill_______填last year还是the last year?这是一道阅读题,原句在文章里是一个小女孩说的,we got very ill last year老师说是填the last year,因为这里相当于直接引语变间接引语,但原题前面 一道关于定语从句的题This is the house _______ we lived in last year?中间该用什么? 帮我解决一道英语改错题Last year we went to Qingdao on vacation .This year we shall go somewhere other .找出错误并改正 the year before last中last的词性如题 一道高中英语语法填空题 There will be a meeting,________(start) later this year to review the film.starting为什么不能填started? 请教英语语法题一道!词典写道：Notice sb. doing.为何这道题答案是nobody notice the thief glide into the house?而不是popping into类?