Susan was fat last year. So she decided more exercise. Now she is much more beautiful.A.

问题补充：

Susan was fat last year. So she decided more exercise. Now she is much more beautiful.

A. take

B. to take

C. taking

D. took

答案：

A. take

(答案→)B. to take

C. taking

D. took

解析：英文中部分动词后跟动词不定式to do做宾语，decide也是属于这一类，故选B，

to take。