【題目】Where have you been all these days? We are very ______ about your safety.
A.interested
B.frightened
C.surprised
D.concerned

【答案】D
【解析】A.interested 感興趣的；B.frightened害怕的；C.surprised吃驚的；D.concerned掛念的，構(gòu)成be concerned about關(guān)心、掛念；句意：這幾天你去了哪兒？我們非常擔(dān)心你的安全。根據(jù)句意，故選D。

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