关于完形填空1请写出判断依据,第50个为何选B,请放大图像,或者放大后借助相关软件查看,50.A.Therefore B

关于完形填空1
请写出判断依据,第50个为何选B,请放大图像,或者放大后借助相关软件查看,
50.A.Therefore B.But C.Through D.While
50.But
51.upwards
52.within
53.mistaking
54.thorough
55.strengthens
56.gracefully
57.so long as
58.self-appreciation
59.stand for
60.enabled
61.cheerful
62.sound
63.merely
64.exposed