问题补充：
He as the tallest boy in the crowd, so I spotted him easily.
A. stood out
B. picked out
C. tried out
D. let out
答案：
(答案→)A. stood out
B. picked out
C. tried out
D. let out
解析：词义辨析题。A. stood out 显眼 B. picked out 挑出 C. tried out尝试 D. let out 释放 他个子高在人群中很显眼因此我很容易认出了他。 根据语境选A
