She is not very good at _gardens

是要翻译吗?
如果翻译成中文应该是：她不太擅长园艺方面的东西或者通俗说,她不太擅长修剪花草、栽培花木.She is not very good at (design )gardens.A,to designB,designedC designing 选呢个？看来你对good at 这个短语用法不清楚啊。这个后面是要加doing的。所以选C。