麻烦好心人过来看看 GWD30-Q3:

葛佳

GWD30-Q3:
Like ants, termites have an elaborate social structure in which a few individuals reproduce and the rest are serving the colony by tending juveniles, gathering food, building the nest, or they battle intruders.

A.    are serving the colony by tending juveniles, gathering food, building the nest, or they battle
B.    are serving the colony in that they tend juveniles, gather food, build the nest, or battle
C.    serve the colony, tending juveniles, gathering food, building the nest, or by battling
D.    serve the colony by tending juveniles, gathering food, by building the nest, or by battling
E.    serve the colony by tending juveniles, gathering food, building the nest, or battling

key E
我觉得D也是平行？ 为什么不行呢？
是不是  gathering food 应该改为 by gathering food？

339215262

D 不平行啊~gathering food 前面少了个by 要省一起省 要不一起保留

葛佳

哦
明白 thx

pansean

对，理论上是的，那结构就完整了，只是罗嗦了。
E. xxxx by tending juveniles, gathering food, building the nest, or battling  这里主要看连接词or后的成分，要跟前面几个动名词形式构成平行。