She is making herself ill with _____ over her son's future.
A.trouble
B.annoyance
C.disgust
D.worry
网友回答
D解析worry既可作动词用，也可以作名词用，意思是“忧虑”，后接介词about或over。worry over 比worry about对某事的忧虑更为持久，更为专注，如：He worries over the least thing that goes wrong.(他总是惟恐有一点小事出错。)