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
短語辨析。  bear out 證實(shí)；hold on  繼續(xù)，堅持；hold up  舉起；work out解決，計算出。句意：我試圖繼續(xù)，但是我是如此累，以至于我再也不能堅持了，故選B。
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