I saw a car in the distance, but I couldn' t______whether it was red or not.
【正确答案】 A
【答案解析】解析：本题考查动词词组辨析。A项“辨认"；B项“对…起作用”；C项“小心”；D项“欺骗”。代入题干，A项最符合题意，故选A。