请教PREP2 67

niswzzhn

67.  (28020-!-item-!-188;#058&003766)

 

A pair of architects in Britain, who say that giant arches, bridges, and walls made of artificial bone could be easier to design and build than conventional structures, and already designed a number of structures, including a bridge, for showing how their idea would work.

 

(A) build than conventional structures, and already designed a number of structures, including a bridge, for showing

(B) build than conventional structures, and they have already designed a number of structures, which includes a bridge, to show

(C) build than conventional structures, have already designed a number of structures, including a bridge, to show

(D) also to build than conventional structures, already designed a number of structures, including a bridge, which shows

(E) to build than with conventional structures, have already designed a number of structures, including a bridge, which shows

这道题目的答案是C，我很奇怪为什么a pair要用复数形式的谓语呢？虽然意思上理解的通啊，但是我记得新东方的老师说要看词的后面又没有s来判断，还举了几个反例没有这个词啊！并且其它的选项也错得离谱！谁能帮忙解释一下啊？

niswzzhn

顶啊！

niswzzhn

顶啊，谁能帮帮忙啊？