结合语境看 应该选择C
he was quick and smart,and his brother as well silly and clumsy.
他又快又聪明,和他的兄弟一样愚蠢、笨手笨脚.
he was quick and smart,and his brother as long silly and clumsy.
他又快又聪明,和他的兄弟一样长愚蠢,和笨拙.
he was quick and smart,and his brother as much silly and clumsy.
他又快又聪明,而他的兄弟则很傻、笨手笨脚.