企源知识库

You may have known someone else for ten years and yet he will never be more than a casual __________.
A、friend
B、colleague
C、acquaintance
D、associate
【正确答案】：C
【题目解析】：认识了十年了，表明认识时间之久，本应该十分熟悉，但是句子后面有转折，说明并不熟，C项：熟人，符合题意。