请教SECTION B 10

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

答案是A　我选择B　因为GEOMETRY是单　　OF　结构前后的　　数的搭配不是太清楚　请教

http://forum.chasedream.com/dispbbs.asp?boardid=23&replyid=142558&id=20256&page=1&skin=0&Star=2

这里有解释

表过程，变化，转折的词要保留。

e.g. become, come, go, remain, turn out, etc..