when they see an o l d man ,they gave the seat to him ----- they were very tired1 because2 though 3if4since

问题描述:

when they see an o l d man ,they gave the seat to him ----- they were very tired
1 because
2 though
3if
4since

2though 尽管
当他们看到一个老人,他们给老人让了座, 尽管 他们很累

2 though.
当他们看到一个老人,他们把座位让了给他,“虽然”他们很累。
1、因为
2、虽然
3、如果
4、自从
从意思上推出是2

because 因为 though 尽管 if表如果 since 是完成时态的标志
这句话的意思是 他们让位给了那个老人 尽管他们很累
所以应该选though

2
because 因为 though 即使 if 如果since 自从
题目中是说他们看到一个老人 就把座位让出来了 ---他们很累
显然是有一个条件让步 即使他们很累

2,他们将作为给了老人,尽管他们也很累.