【正确答案】 B

【答案解析】[理由] 本句测试下列固定短语：
speak highly of... 大力赞扬……
=highly praise...
[例] The teachers speak highly of John.
(老师们对约翰大表赞扬。)
highly(高度地)通常用来修饰表“赞扬”或“推荐”等动词。
highly praise… 极力赞扬……
highly recommend… 极力推荐……
[例] They highly recommended him for the job
(他们极力推荐他做这份工作。)
根据上述，(B)应为正选。