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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。時間狀語從句中用一般現在時表示將來，by加將來時間與將來完成時連用。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。表示到將來某時（her next birthday）為止勢必會完成的情況，英語要用將來完成時，故選D。又如：

Don’t worry. It’s a storm in a teacup. Everyone will have forgotten about it by tomorrow.  別擔心，這不過是茶杯里掀風浪，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. 如果他們在歐洲獲得成功，他們將會改變世界政治和經濟格局。

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。根據句中的by next month可知空格處應填將來時態，故可排除C和D；至于是選A還是B，則需根據句意來確定，由于前文已說“正準備買車”，說明存錢已經存夠了，故不宜選B。句意為：“我聽說詹森計劃要買一輛車。”“我知道，到下個月，他積蓄的錢就夠買一輛二手車了。”

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