I tried to work on, but I was so tired that I could no longer _____
A.bear outB.hold onC.hold upD.work out在线课程B
短语辨析。bear out证实；hold on继续，坚持；hold up举起；work out解决，计算出。句意：我试图继续，但是我是如此累，以至于我再也不能坚持了，故选B。