大学英语215.By the time you get to Greenwich,you the most histor

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大学英语2
15.By the time you get to Greenwich,you the most historic part of London.
A.will be seeing B.will see
C.are going to see D.will have seen
16.Please bring me some books next time when you .
A.will come B.come C.have come D.are coming
17.He wondered whether I the birthday party the next day.
A.will attend B.attended
C.had attended D.would attend
19.It was a lovely day yesterday.I wish I at the seaside then.
A.were B.had been
C.should be D.shall have been
21.The whole family greeted me as though I a member of the family.
A.Am B.were C.would D.should be
46.Tom,with a dog,standing on the floor upstairs yesterday.
A.was B.were C.are D.will be
48.Each of your brothers responsible for the accident.
A.are B.is C.am D.be
需要确认15、21、答案与解释不统一

15.D 有by the time 在某个时间之前 ,用完成时. 翻译一下更好理解:在你到达greenwich之前,你(将会)已经看见伦敦最古老的地方..即,当你真正到达greenwich时,你已经看见伦敦最古老的地方.
16.B.条件状语从句或时间状语从句(二者主句是一般现在时) 或祈使句中,从句用一般现在时表示将来时...题中用一般现在时come表示将来时"will come"
17.D 宾语从句中,主句是一般过去时,从句用所需时态的过去时,显然,这里用将来过去时
19.B 虚拟语气,对过去情况的虚拟用过去完成时,我希望我那时在海边(实际上那时我没有在)...
21.A 虚拟语气,as though 后面跟的不是真实的情况,用were
46.A 不用多讲用过去时吧,有yesterday,with a dog是个类似于插入语,放句末就一目了然了.
48.B each表示(两个或两个以上)团体中的每个,既然是"每个"当然用单数

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