几道时态英语题1.-Shall we go to the park now?-Not until I ( ) my ph

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几道时态英语题
1.-Shall we go to the park now?
-Not until I ( ) my physics exercises.
用finish填
答案是have finished
为什么不能用finish,不是一般现在时表将来吗?
2.The new secretary is supposed to report to the manager as soon as she ( )
答案是arrives,为什么不能用have arrived
3.-Did you write to Mary last month?
-Noi,but I'll ( ) her over Chrismas Day
答案是be seeing ,为什么不能用see
4.The last half of the nineteenth century ( ) the steady improvement in the means of travel
答案是has witnessed 为什么不是witnessed

的第一题,你应该确定时态位将来完成时,然后又因为现在时表将来,所以用现在完成时.have finished
第二题,只是纯粹阐释客观事实,新秘书要尽快向经理报告,所以用一般现在时
第三题,如果是表示计划打算,一般会用be going to不会用wiill.在这里的will be doing 形式表示将来某个具体时刻（圣诞节那天）我正在所得事情
第四题,has witnessed 表示过去的事情对现在的影响,而witnessed只说明这件事发生在过去,对现在没有任何影响,显然,根据语意,19世纪的下半部分见证了旅游方式的稳定发展是与现在息息相关

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