I have studied enough for this test .I'm confident of __(pass) the exam

I have studied English for three months. I have studied English s____ I was six years old. I have studied English for 7 years.同义句 Have you ever studied _______a group?Yes ,I have.I have learned a ______ that way. I have studied English for 7 years.(同义转换)* * * 7 years since I studied English.(*为一个空格) should have studied I know little English now,though I_________ it for four years in university.A.studied B.had studied C.have studied D.was studying --I failed in the exam.--sorry to hear that,if only you__with greater care.A.had studied B.studied C.have studied D.study i studied hard and has/have gained a series ofi studied hard and has/have gained a series of scholarship 一句话是用have 还是has 怎么区分 Rober is said_____abord, but I do not know which cuntry he studied inAto have studied B to have studing C to have been studing I told Sally how to get there,but maybe I ()for here.a.must have studied b.might studyc.should have studied d.would study when和since有什么区别I studied English when I was a small child和I have studied English since I was a child分别是什么意思 I would have been smarter,if I had studied more.I would be smarter,If I studied more.有什么区别?（时态区别） I have studied English or three years since I had come here.（改错） I have studied enough for this test .I'm confident of __(pass) the exam I have studied French since the day I came here.请问应该怎么翻译? be,beenhe is said ____ abroad,but I don't know what country he studied in.have studied,不可以是to have been studying I love music so much that not a day passes when I do not regret ( )music in my youth.A.not to have studied B.not having studiedC.having not studied D.to have not studied说明理由