She is making herself ill with _____ over her son's future.
A．troubleB．a(chǎn)nnoyanceC．disgustD．worry
D
worry既可作動詞用，也可以作名詞用，意思是“憂慮”，后接介詞about或over。worry over 比worry about對某事的憂慮更為持久，更為專注，如：He worries over the least thing that goes wrong.(他總是惟恐有一點小事出錯。)
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