大全851

knight9514

1. 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

D 为什么不对，因为时态吗？

huahua115

1)the work 作主语,谓语动词即使时一般现在数,也应该加s

2)没有人提过,我觉得d中用so-called改变句意,因为so-called是<所谓的 >的意思.原句中没有这种意思.而且原句有turn out

不能随便乱删

alanguo

不是呀，主语是work。