问题
选择题
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
答案：B
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。
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