The class teacher came up and put a jacket the boy to prevent him from catching a cold .A

问题补充：

The class teacher came up and put a jacket the boy to prevent him from catching a cold .

A. by

B. with

C. off

D. over

答案：

A. by

B. with

C. off

(答案→)D. over

解析：句意为：当堂老师上来为那个男孩披上一件夹克，以免他感冒。over有“覆盖”的意思，根据句意应选D。