If you decide to learn a foreign language ,you must work hard on it every day.Only in this way can you have a good ____D____of it.A concern B company C condition D command为什么要选D

问题描述:

If you decide to learn a foreign language ,you must work hard on it every day.Only in this way can you have a good ____D____of it.
A concern B company C condition D command
为什么要选D

have a good command of sth固定搭配,意思是对某事掌握的很好.