None of us was good at swimming, so the crossing of this dangerous river was rea

None of us was good at swimming, so the crossing of this dangerous river was really a______.

A.motivation

B.symptom

C.conflict

D.challenge

试题答案

D

解析：

考查名词辨析：A．motivation动机B．symptom症状C．conflict 冲突D．challenge挑战，句意：我们没有人擅长游泳，所以过这条危险的河真是挑战。选D。