Question

Those ____ finished doing it put up your hands.

Answer 1

1.答案：选A,即 Those who have finished doing it put up your hands.

2.翻译：那些完成任务的人,请举手.

3.语法：主句是 Those put up your hands（那些人请举手.）为了说明是哪些人,所以在 those 后面用了一个定语从句：who have finished doing it（他们已经完成了任务）

4.澄清：that 也可以引导定语从句,但是这个 that 是不能变成 those 的,由于它作主语,所以是不能省略的.