Immediately he was elected monitor James his duties since.A. took upB. has taken upC. ma

问题补充：

Immediately he was elected monitor, James his duties since.

A. took up

B. has taken up

C. made up

D. has made up

答案：

A. took up

(答案→)B. has taken up

C. made up

D. has made up

解析：考查时态。Take up开始从事；make up组成，整理。句意：自从詹姆斯负起他的责任，詹姆斯立即被选为班长。结合语境可知下文描述的现在已经完成的动作，选B。