The baseball is the floor the deskA. under; onB. under; underC. on; onD. on; under

问题补充：

The baseball is the floor the desk．

A. under; on

B. under; under

C. on; on

D. on; under

答案：

A. under; on

B. under; under

C. on; on

(答案→)D. on; under

解析：考查介词用法。本题考查的是棒球的位置，根据句子意思的需要可知应该在地板上on the floor，课桌下under the desk，故选D。