单选题
I don"t have any ______ plan for the weekend—I was thinking of spending some time with my family or perhaps getting together with some friends.
【正确答案】
C
【答案解析】[解析] 考查形容词辨析。concrete“明确的；有形的；具体的”符合句意。A．confident“有信心的，自信的”；B．conservative“保守的，守旧的”；D．considerate“体贴的，考虑周到的”。