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12.i’ll give the message to her as soon as she_________.

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12.i’ll give the message to her as soon as she_________.
A.return B.will return C.returns D.returned
13.great changes_________in shanghai in the past twenty years.
A.has taken place B.have taken place C.had taken place D.took place
14.i wonder if chris_______to see me tomorrow.If she__________i will take her to the garden.
A.will come…will come B.comes…comes
C.will come…comes D.comes…will come
15.the story_______to one of my friends three years ago.
A.was happened B.is happened C.happened D.happening
18.by the end of the coming2003,the foreigners here________all parts of china.
A.have visited B.will have visited C.will visit D.will visit
21.the famous singer________here if he comes here.
A.will welcome B.will be welcome C.is welcome D.welcome
请从语法的角度详解.
12.i’ll give the message to her as soon as she_________.
12 选 C,这是时间状语从句的考点,主句用一般将来时,从句就用一般现在时表示将来动作,而不用直接用将来时.
13.选 B,in the past twenty years这个状语要求用现在完成时态,changes是复数,所以谓语要用have,而不用has
14 选 C,第一个是宾语从句,时态要保持一致,时间状语为tomorrow,所以用will come一般将来时态,而另外一句是考察if引导的条件状语从句,if从句用一般现在时表示将来,主句用一般将来时态.
15 C,happen是没有被动语态的,再从时间状语three years ago 判断这是个过去时,所以选happened
18 选 B,by the end of 这个时间状语判断,这里要用现在完成时,再从 the coming2003 判断,要用一般将来时,所以综合起来要用will have visited
19 B,同样的是考察if条件状语从句的用法.If从句一般现在时,主句一般将来时.