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
【正确答案】
D
【答案解析】
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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