It is our d( ) to study hard when we are young.It is our d( ) to study hard when we are young.根据句意及提示写词。

问题描述:

It is our d( ) to study hard when we are young.
It is our d( ) to study hard when we are young.根据句意及提示写词。

It is our duty to study hard when we are young.

duty 职责