— I thought you were proud of the coat I ________.

— I'm afraid not. You'd better change it for another. [ ]

A. would wear  

B. had worn

C. wore 

D. wear

扁形动物的排泄系统属原肾管型，是外胚层内陷形成的；由焰细胞、排泄管和排泄孔组成。但实际上焰细胞是 （14）和 （15） 在光学显微镜下不能分清而看成一个细胞所致。