问题
选择题
I tried to work on, but I got so tired that I could no longer ________.
A．keepout
B．comedown
C．comeup
D．holdout
答案
答案：D
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I tried to work on, but I got so tired that I could no longer ________.
A．keepout
B．comedown
C．comeup
D．holdout
答案：D