11. By the time we get to the restaurant, everyone ______ eating already.
(A) had finished
(B) has finished
(C) will have finished
(D) would have finished

1.   [ By the time ]是連接詞，假如它引導的子句是描述未來，主要子句要用未來完成式。例句如下：

      a) By the time they are released, they will have learned some skills to begin their new lives.

      b) By the time Dad comes home, I will have finished my homework.

      雖然[ By the time ]引導的子句是描述未來，但其動詞要用現在式。

2.   [ By the time ]引導的子句也可以描述過去，主要子句要用過去完成式。例句如下：

      a) By the time I finished my homework, my young brother had gone to bed.

      b) By the time I got to Maggie’s place, she and her friends had all waited for me.

3.   除[ By the time ]的句型外，還有另一類似句型：

      [ By + 未來時間, 主詞 + 未來完成式 … ]

      例句如下：

      a) By the year 2050, the world will have lacked for enough food.

      b) By this time next year, this company will have sold billions of smart phones.

翻譯看起來很像 是過去完成，"當我們到餐館時，每個人都已經吃完了______"

但是by the time用法與中文翻譯不同...

請參閱3F