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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
correct answer：D 平行结构我可以理解，但是but后应该是一个independent sentence，那么 method做主语，has been to form 这个用法是什么意思呢，哪位可以解答一下，感激不尽！
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发表于 2016-9-29 17:32:58
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