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

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：句中有否定词hardly，故后面要使用否定词neither，“敌军进退两难’’。