I tried to work on but I was so tired that I could no longer .A. bear outB. hold onC. h

问题补充：

I tried to work on, but I was so tired that I could no longer .

A. bear out

B. hold on

C. hold up

D. work out

答案：

A. bear out

(答案→)B. hold on

C. hold up

D. work out

解析：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。