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木糖猪 · 发表于 2013-9-8 21:34:33

851.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
(E) aperiodic tiles, it turned out to describe

D为什么不可以？

谢谢各位！

cyuyolanda · 发表于 2013-9-8 21:36:54

D应该是describes啊

木糖猪 · 发表于 2013-9-9 01:09:53

cyuyolanda 发表于 2013-9-8 21:36
D 应该是describes啊

艾玛我太粗心！！！谢谢谢谢

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