TTGWD3-26 郁闷找不到讨论帖,谁来解答一下

Q26:

There are several ways to build solid walls using just mud or clay, but the most extensively used method has been the forming of bricks out of mud or clay, and, after some preliminary air drying or sun drying, they are laid in the wall in mud mortar.

1. the forming of bricks out of mud or clay, and, after some preliminary air drying or sun drying, they are laid
2. forming the mud or clay into bricks, and, after some preliminary air drying or sun drying, to lay them
3. having bricks formed from mud or clay, and, after some preliminary air drying or sun drying, they were laid
4. to form the mud or clay into bricks, and, after some preliminary air drying or sun drying, to lay them
5. that bricks were formed from mud or clay, which, after some preliminary air drying or sun drying, were laid

这题答案选D, 选项前后倒是对称,问题是have been to do sth 这种用法语法有问题吧．大家帮帮忙