讨论区关于此题无更好的解释.哪位前辈能帮忙解释一下.
The work of mathematician Roger Penrose in the early 1970s, on the geometry of what are called aperiodic tiles, turned out to describe the architecture of a previously unknown class of crystals.
(A) what are called aperiodic tiles, turned out to describe
(B) what is called aperiodic tiles, describes
(C) aperiodic tiles, describing
(D) so-called aperiodic tiles, describe（A）
(E) aperiodic tiles, it turned out to describe
主语是 work,后面应是is called, describes. 为什么选A呀,
楼主可先看下下面这个贴，里面有个对换表，你可以找到你这题在大全987中的位置，然后可以用搜索功能搜索以前的讨论贴。
http://forum.chasedream.com/dispbbs.asp?boardID=23&ID=79830&page=1
下面这个你也可参考一下，如还有问题再讨论。
http://forum.chasedream.com/dispbbs.asp?BoardID=23&ID=57755
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