问题补充:
to improving services, we will provide customers with all the information they need.
A. Being committed
B. Having committed
C. Committed
D. Committing
答案:
A. Being committed
B. Having committed
(答案→)C. Committed
D. Committing
解析: 句意:承诺要提高服务,我们会给顾客提供他们需要的信息。Be committed to doing sth承诺做…,用过去分词做状语,相当于Because we are committed to improving services,选C。