The students running on the playground are all in their uniforms so it’s hard for you to

问题补充：

The students running on the playground are all in their uniforms, so it’s hard for you to my sister in them.

A. take up

B. take out

C. pick up

D. pick out

答案：

A. take up

B. take out

C. pick up

(答案→)D. pick out

解析： 词义辨析。take up占据；take out 取出；pick up拾起，捡起；pick out认出。句意：操场上跑步的学生都穿着校服，所以你很难从他们中认出我的妹妹。选D。