Nowadays many parents make their children study various subjects weekends.A. withB. atC.

问题补充：

Nowadays many parents make their children study various subjects weekends.

A. with

B. at

C. by

D. to

答案：

A. with

(答案→)B. at

C. by

D. to

解析：句意：现在许多父母让他们的孩子在周末学习各种各样的的科目？at weekends.固定词组在周末，结合语境故选B