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 (E) aperiodic tiles, it turned out to describe
"事情发生在过去,其影响一直发生到现在"适用于现在完成时。现在完成时用于表示说话之前已发生的动作但对现在仍有影响,或是由过去某点延续至说 话时的动作,完成时有一些标志性的时间状语,如:already, yet, just, ever, since, for,so far, up to now, in the past years等。
可能是 turn out to describe , 这个动作主要是turn out ,发生在过去。
如果谓语动词是describe, 我想应该用describes
有道理。
我在A与B两个选项中绕了好久:
(A) what are called aperiodic tiles, turned out to describe (B) what is called aperiodic tiles, describes --动词时态用DESCRIBES和TURNED OUT TO BE都可以。但是B选项aperiodic tileS,谓语动词应当用ARE。因此选A。