问题补充：
I tried to work on, but I was so tired that I could no longer .
A. hold out
B. keep out
C. stick to
D. insist on
答案：
(答案→)A. hold out
B. keep out
C. stick to
D. insist on
解析：hold out坚持；keep out挡在外面；stick to 坚持不变；insist on坚持意见。
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