英国发动鸦片战争的根本目的是[ ]

A、保护鸦片贸易

B、割占中国领土

C、打开中国商品市场

D、争取外交礼仪平等

It took him a long time to _________ the skills he needed to become a professional artist.

A．require

B．acquire

C．inquire

D．gather