I ’ve made a habit to sleep early and rise early which enables me to keep energetic .A. t

问题补充：

I ’ve made a habit to sleep early and rise early, which enables me to keep energetic .

A. this

B. it

C. that

D. /

答案：

A. this

(答案→)B. it

C. that

D. /

解析：句意：我形成早睡早起的习惯，这使我能保持精力充沛。这句话用了make+it+名词+to do句型，it是形式宾语，不定式是真正的宾语，选B。