请教语法大全中的几道题

汪王颖

1.        The Emperor Augustus, it appears, commissioned an idealized sculptured portrait, the features of which are so unrealistic as to constitute what one scholar calls an “artificial 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 enough so as to constitute为什么C不对？这里的they可以指代features呀。

799. The owner of Steele’s Grocery in Osage, Ohio, saved $600 monthly on heat during the winter by putting all his refrigerator air compressors together in an insulated compartment, then installing two fans and a duct that carried waste heat from the compressors into the main part of the store.

(A) then installing two fans and a duct that carried

(B) then he installing two fans and a duct that carried

(C) then two fans were installed with a duct that carried

(D) installing two fans, and then carrying through a duct（A）

(E) installing two fans, and a duct carrying

本题选A， 但是by putting ... , then installing..., 中间两个并列成分没有and连接，难道这不是错的吗？

商之隐

1. C 中没有明显表示使用have done形式。
2. 可以使用排除法来做：
B. CDE都没有A的意思明确一下。