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

问题补充：

.

He at once when I promised to help him.

A. cheered up

B. gave up

C. lighted up

D. turned up

答案：

(答案→)A. cheered up

B. gave up

C. lighted up

D. turned up

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