---How was their last weekend?-Great. They had a picnic in the park and enjoyed .A. the

问题补充：

---How was their last weekend?

---Great. They had a picnic in the park and enjoyed .

A. them

B. they

C. their

D. themselves

答案：

A. them

B. they

C. their

(答案→)D. themselves

解析：enjoy oneself的主语为they ，故后接themselves，故选D