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I tried to work on, but I was so tired that I could no longer _____ .
A.bear outB.hold onC.hold upD.work out
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。
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