Nowadays the roles of husband and wife are not as defined as before especially when both

问题补充：

Nowadays the roles of husband and wife are not as defined as before, especially when both parents work and earn money for the family.

A. clear

B. clearer

C. clearly

D. more clearly

答案：

A. clear

B. clearer

(答案→)C. clearly

D. more clearly

解析： as…as…之间要用原级，故先排除B和D；又由于此处defined是动词，它要用副词来修饰，故C正确。