单项选择题

The son was so concerned about the illness of his father.

A. serious
B. happy
C. lucky
D. worried
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单项选择题
He is suspicious about her motivation to attend the party.
A. sure
B. angry
C. doubtful
D. worried
单项选择题
She was so grateful to him and decided to marry him.
A. careful
B. useful
C. hopeful
D. thankful
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