OG16-SC-38

PurpleSun520

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.

• Athe forming of bricks out of mud or clay, and, after some preliminary air drying or sun drying, they are laid
• Bforming the mud or clay into bricks, and, after some preliminary air drying or sun drying, to lay them
• Chaving bricks formed from mud or clay, and, after some preliminary air drying or sun drying, they were laid
• Dto form the mud or clay into bricks, and, after some preliminary air drying or sun drying, to lay them
• Ethat bricks were formed from mud or clay, which, after some preliminary air drying or sun drying, were laid
  

答案选D，根据排除可以选出来。但是有个问题，这里的 have been to 是什么意思？ 感觉放在这里非常奇怪啊~

PurpleSun520

非常感谢~~

alzn2765

GMAC的习惯之一：严谨。怕犯错误。
用has been就是“截止到目前为止”的意思，不排除以后这个方法就不是most extensively used method了。说不定以后直接3D打印个墙出来？
这么措辞的，一种人是GMAC，另一种人是律师。。。