问题
选择题
--Monitor?
--- I’m not monitor of our class. I __ with the teacher until the monitor is elected.
A．will just help
B．am just to help
C．am just helping
D．have just helped
答案
答案：C
考查时态，句意是：--班长？--我不是班长，我只是帮老师忙直到班长选出来。说明帮忙是暂时的，现在进行时可以表示现阶段暂时的动作，选C。