_______ for more than 30 years, we are confident we can give our customers complete satisfaction.
A、Being in business
B、Having been in business
C、In business
D、We are in business
【正确答案】：B
【题目解析】：强调动作虽然发生在过去，但是对现在有影响或结果，用现在完成时，动词放在句首一般使用动名词形式，即ing形式
句意：经过30多年的经营，我们有信心能让客户完全满意。
