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1. By the time Jane gets home his aunt ______ for London to attend a meeting.

A. will leave                                                 B. leaves                  

C. will have left                                            D. mind

分析：C。時(shí)間狀語(yǔ)從句中用一般現(xiàn)在時(shí)表示將來(lái)，by加將來(lái)時(shí)間與將來(lái)完成時(shí)連用。又如：

By May I will have got a new car. 到5月我將已買到一輛新汽車。

The old currency will have been phased out by 2020. 舊幣分階段至2020年將全部禁止流通。

2. On her next birthday, Ann ______ married for twenty years.

A. is                                                            B. has been              

C. will be                                                     D. will have been

分析：D。表示到將來(lái)某時(shí)（her next birthday）為止勢(shì)必會(huì)完成的情況，英語(yǔ)要用將來(lái)完成時(shí)，故選D。又如：

Don’t worry. It’s a storm in a teacup. Everyone will have forgotten about it by tomorrow.  別擔(dān)心，這不過(guò)是茶杯里掀風(fēng)浪，到明天大家就都把這事給忘了。

If they succeed on Europe, then they will have reshaped the political and economic map of the world. 如果他們?cè)跉W洲獲得成功，他們將會(huì)改變世界政治和經(jīng)濟(jì)格局。

3. —I hear that Jason is planning to buy a car.

—I know. By next month, he _______ enough for a used one.

A. will have saved                                         B. will be saving      

C. has saved                                                 D. saves

分析：A。根據(jù)句中的by next month可知空格處應(yīng)填將來(lái)時(shí)態(tài)，故可排除C和D；至于是選A還是B，則需根據(jù)句意來(lái)確定，由于前文已說(shuō)“正準(zhǔn)備買車”，說(shuō)明存錢已經(jīng)存夠了，故不宜選B。句意為：“我聽(tīng)說(shuō)詹森計(jì)劃要買一輛車。”“我知道，到下個(gè)月，他積蓄的錢就夠買一輛二手車了。”

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