先祝大家圣诞快乐! OG 88 The Emperor Augustus, it apperas, commissioned an idealized sculpture portrait, the features of which are (so unrealistic as to constitute) what one scholar calls an "artifical face". A. so unrealistic as to constitute B. so unrealistic they constituted C so unrealistic that they have constituted D. unrealistic enough so that they constitute E. unrealistic enugh so as to constitute 答案是A, OG 解释答案C错是因为时态不对:"The verbs are and calls indicate that sculpture is being viewed and judged in the present. Thus, neither the past tense constituted in B nor the present perfect verb have constitued in C is correct. " 然而再看OG 136 Although schistosomiasis is not often fatal, (it is so debilitating that it has become an economic) drain on many developing countries. A. it is so debilitating that it has become an economic B. it is of such debilitation, it has become an ecnomical C. so debilitating is it as to become an economic D such is its debiliation, it becomes an economical E. there is so much debilitaiton that it has become an economical 答案是A。 这里的时态就没有问题吗? 请教诸位大侠。 另,答案C 的错在哪里? "so....that... "and "so... as to .." 的不同在哪里? 谢谢。