13.______ has been atopic of continual geological research.A)did the continentsoriginateB)how did thecontinents originateC)have thecontinents originatedD)how thecontinents originated

47.She ______ up for two hours.A.has got B.has been C.has been got D.had been Mathematics ______ the language of science. a. is b. has been c. are d. have been Mrs.Green ______ here since the factory opened.A.has goneB.has beenC.has arrivedD.has been in ( )My English teacher ______ England twice.A.has been to B.has gone to she ______-England.she has been in London for a weekhas gone to 应填 has been to 13. This is one of the best books ______ ever been written on the subject.A) which has B) which have C) that has D) that have 为什么不能选B 而选A呢?--Has he been home?---______,he _________home since he graduated.A.No; hasn't been B.Yes;has been Mr Smith with his parents ______ China since two years ago.A .have been in B has been C has been to说明理由 5.None of them ______ my friends.A) is B) are C) was D) has been None of them ______ my friends.a.is b.are c.was d.has been It has been raining ______ last Saturday.A：on B：for C：till D：since It is not I who ______ wrong.A.is B.are C.am D.has been It has been raining ______ last Saturday.A：on B：for C：till D：since she has been a mother of two children,______?(改为反义疑问句） 单词变形It has been a ______(please) meeting you.只能写一个单词 Mathematics ______ the language of science.A.is B.has been C.are D.have Mike told me that he ______ out the week before.A)has been B)is C)had been D)was ______ all that has been said,the tourists have been picking leaves.______ all that has been said,the tourists have been picking leaves.a.In spite b.Despite c.Even d.Even so