10. 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
A偶选B了
1。 what引导名词性从句，系动词由表语决定？？？
2，一项研究成果为什么不能用一般现在时？B为什么错？因为前文有明确时间in the early 1970’s 嘛？
同意你的解释
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