到底和谁平行？OG16 SC38 求解

芊层酥

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.答案里说form这个词是和to build walls平行的，所以要用to form. 但是按我的理解，forming bricks和using just mud应该是平行的，因为这两种都是搭墙的方式呀。

附选项：
(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



（我选了B，虽然后来发现B也有其他错误，但还是不理解form为什么要用to do形式。）


提前感谢！

vi.len

我当初做这道题直接是根据选项中AND前后是否平行选出来的。
这一整句话由两个完成句子组成，第一句是说有几种方式to build墙体，第二句话是说最有效的方式（method可以理解成way）是to form砖头（用泥巴或者黏土）。所以to build和to form要平行