问题补充：
His parents showed no signs of to his demands.
A. giving in
B. giving off
C. giving up
D. giving out
答案：
(答案→)A. giving in
B. giving off
C. giving up
D. giving out
解析：词组辨析题。A. giving in 屈服 B. giving off散发C. giving up放弃 D. giving out 发出句意：他的父母没有表现出向他的要求屈服的迹象。根据语境选A
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