We must on our study..A. concentrateB. concentrate atC. concentrate onD. concentrate wit

问题补充：

We must on our study..

A. concentrate

B. concentrate at

C. concentrate on

D. concentrate with

答案：

A. concentrate

B. concentrate at

(答案→)C. concentrate on

D. concentrate with

解析：题意为：我们必须全神贯注于我们的学习。此题考查固定短语的应用。Concentrate on … 意为“集中（注意力）于….专心于…”。其余选线不存在搭配。故选C。