很简单的一道问题~~

哎唷不小心

There are several waysto build solid walls using just mud or clay, but the most extensively usedmethod has been the forming of bricks out of mud or clay, and, after somepreliminary air drying or sun drying, they are laid in the wall in mudmortar.

A.    the forming of bricks out of mud or clay, and, after some preliminary airdrying or sun drying, they are laid

B.    forming the mud or clay into bricks, and, after some preliminary airdrying or sun drying, to lay them

C.    having bricks formed from mud or clay, and, after some preliminary airdrying or sun drying, they were laid

D.     to form the mud or clayinto bricks, and, after some preliminary air drying or sun drying, to laythem     (D)

E.    that bricks were formed from mud or clay, which, after some preliminaryair drying or sun drying, were laid

D，老题
我想问下这里红色部分不用have been呀，后面不是to...and to...么？
谢谢~

wyw1018

agreement是主语和谓语搭配

哎唷不小心

wyw1018 发表于 2013-11-20 20:52
agreement是主语和谓语搭配

谢谢。但一般宾语需不需要保持一致呢？
然后这种主系表结构，主语，系动词是单数，表语是复数，有这种情况吗？
灰常感谢~