Question

He ____(do) his homework all day. all day 用什么时态？？

Answer 1

这个地方all day与使用何种时态基本没有关系，也就是说用任何时态都可能。
参考iciba：
adv.整天； 一天到晚
1. I' ve been on my legs all day and I'm tired out.我整天站着，累极了。
来自《简明英汉词典》
2. Mike doesn't study at all.Instead, he sits idle all day.迈克根本不肯读书，相反地，他终日游手好闲。
来自《简明英汉词典》
3. He was confined within the four walls of an office all day.他整天被关在办公室里。
来自《简明英汉词典》
4. She used to slop around all day in old jeans and sweatshirts.以前，她时常整天穿着旧牛仔裤和运动衫闲逛。
来自《简明英汉词典》
5. She wrote away all day, filling page after page.她写了一页又一页，整整写了一天。
来自《简明英汉词典》

Answer 2

本题既可填 did; 也可以填 has been doing. all day 所在的句子既可以是一般过去时，也可是现在完成进行时。

Answer 3

is doing all day 用现在进行时 。