A recent poll of elected officials suggests that candidates, when in the midst of a tough campaign, often make statements about an opponent that they may not think is true.
A. Is
B. are
C. to be
D. of as
E. it is
OA:B
我认为that是指代statements的,are则是that的系动词,但是they may not think打乱了我的思路。。。请各位友邻指教一下这个结构到底是怎么回事好么?