a growing number of Americans in their 20s and 30s __(head) for c_英语解答

a growing number of Americans in their 20s and 30s __(head) for china for employment
A headed B are heading C have been having D had headed

人气：440 ℃　时间：2019-08-18 06:19:36

解答

have been having
一直在源源不断的到中国来打工
我是根据a growing number来判断的
这题有点奇怪啊