OG12 66

The 32 species that make up the dolphin family are
closely related to whales and in fact include the animal
known as the killer whale, which can grow to be 30
feet long and is famous for its aggressive hunting
pods.
(A) include the animal known as the killer whale,
which can grow to be 30 feet long and is
(B) include the animal known as the killer whale,
growing as big as 30 feet long and
(C) include the animal known as the killer whale,
growing up to 30 feet long and being
(D) includes the animal known as the killer whale,
which can grow as big as 30 feet long and is
(E) includes the animal known as the killer whale,
which can grow to be 30 feet long and it is

对OG解释的D不理解，为什么说as big as is an idiomatically incorrect expression of the comparison;
请NN帮忙看看，谢谢。