. I had to because someone else wanted to use the phone. A. give upB. put upC. hang upD.

问题补充：

. I had to because someone else wanted to use the phone.

A. give up

B. put up

C. hang up

D. ring up

答案：

A. give up

B. put up

(答案→)C. hang up

D. ring up

解析：give up 指“放弃”；put up 指“举起，架起，修建，张贴”等；hang up 指“挂断(电话)”；ring up 指“给某人打电话”。