Where have you been all these days? We are very _____ about your safety.

A. interested
B. frightened
C. surprised
D. concerned
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科目：高中英語 來源：0119 期中題 題型：單選題

Where have you been all these days? We are very _____ about your safety.
[     ]
A. interested
B. frightened
C. surprised
D. concerned

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