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几道英语时态填空~1.I must take it back the day after tomorrow.You ca

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几道英语时态填空~
1.I must take it back the day after tomorrow.You can only______it for 24 hours.(keep)
2.In his letter,he said that he______us very much.(miss)
3.You______(drop)your pencil.Pick it up.
4.Great changes______in our country since 1978.(take place)
5.Every time he tried to start the car,the wheels______deeper to the mud.(sink)
6.Yesterday Mary couldn't finish her homework,so she has to go on______it this afternoon.(do)
1 前面又can,用原型 keep
2 he said,时态一致 missed
3 事情发生在说话前,个人认为用过去时 dropped(@.@最恨这种题,没上下文还非要认填空)
4 因为有since,个人认为是完成时的标志 have taken place
5 与前半句时态一致 sank
6 go on doing,固定用法,doing