6. _________, domesticated grapes grow in clusters, range in color from pale green to black, and contain sugar in varying quantities.
A. Their botanical classification as berries
B. Although their botanical classification as berries
C. Because berries being their botanical classification
D. Classified botanically as berries
請問為什麼是d不是a??THEIR代grow in clusters, range in color from pale green to black, and contain sugar in varying quantities.不是嗎???