The enemy troop could hardly make any advance and could they fall back. A. neitherB. so

问题补充：

The enemy troop could hardly make any advance, and could they fall back.

A. neither

B. so

C. either

D. both

答案：

(答案→)A. neither

B. so

C. either

D. both

解析：本题考查代词。根据could they fall back用倒装结构和句意，故用否定词neither，故选A