He at once when I promised to help him.A. cheered upB. gave upC. broke upD. turned up

问题补充：

He at once when I promised to help him.

A. cheered up

B. gave up

C. broke up

D. turned up

答案：

(答案→)A. cheered up

B. gave up

C. broke up

D. turned up

解析：考查词组：A. cheered up振作起来B. gave up放弃C. broke up分手，破裂D. turned up出现，句意：当我答应帮他的时候，他立刻高兴起来。选A。