作者：英吉
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.
（A）the forming of bricks out of mud or clay, and,
after some preliminary air drying or sun drying
they are laid
(B) forming the mud or clay into bricks, and, after
some preliminary air drying or sun drying, to
lay them
(C) having bricks formed from mud or clay, and,
after some preliminary air drying or sun drying
they were laid
(D) to form the mud or clay into bricks, and, after
some preliminary air drying or sun drying, to
lay them
(E) that bricks were formed from mud or clay,
which, after some preliminary air drying or sun
drying, were laid
题目分析：原文划线部分用and连接了两个并列成分，就是怎么做砖头并且怎么筑成墙。A前面用the forming of bricks而后面用they are laid显然无法形成并列关系，杀掉。B前面用forming后面用to lay them显然也不合适。C前面用having后面用they were laid不并列，杀。D前后都用to do，符合并列，留着。E连那个并列关系都没有体现出来，干掉！
