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(mǎi)到一輛新汽車(chē)。

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。

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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。

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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(mǎi)車(chē)”，說(shuō)明存錢(qián)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(mǎi)一輛車(chē)?！薄拔抑?，到下個(gè)月，他積蓄的錢(qián)就夠買(mǎi)一輛二手車(chē)了。”