【题目】______ go out for food. Some work in the tunnels as guards and workers.
A.Not all the ants
B.All the ants not
C.Both the ants don't
D.All the ants

【答案】A
【解析】句意：并非所有的蚂蚁都外出觅食。一些工作在隧道当保安和工人。部分否定的结构是not all do或者all…don't，因此选A。