单选题I tried to work on &

问题补充：

单选题Itriedtoworkon,butIwassotiredthatIcouldnolonger___.A.hold outB.keep outC.stick toD.insist on

答案：

A解析hold out坚持；keep out挡在外面；stick to 坚持不变；insist on坚持意见。