【单选题】 My friend's parents were very upset when she didn't phone them from my house.
A．frightened
B．preoccupied
C．busy
D．worried
网考网参考答案：D
网考网解析：
frightened：惊恐的，受惊的；preoccupied：出神的；busy：忙碌的，繁忙的；worried：不安的。题中upset意为“不安的”，可知D项符合题意。
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