Bob used to be a "problem child", but his mother was very patient and didn't _______ trying to help him. [ ]

A. give out

B. give away

C. give up

D. put up

“鸡尾酒疗法”治疗艾滋病所使用的药物包括

A．蛋白酶抑制剂

B．核苷类似物逆转录酶抑制剂

C．碱基类似物逆转录酶抑制剂

D．非核苷逆转录酶抑制剂