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

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• a growing number of Americans in their 20s and 30s __(head) for china for employmentA headed B are heading C have been having D had headed
• In the last few years,a growing number of Americans in their 20s and 30s __ for China for employment, attracted by its faster-growing economy.A.headed B.are headingC.have been heading D.had headed答案选C,我想问这句话是什么意思?
• is has a lot of only he years three he but always old questins 连词成句
• The writer told us that he________ a great number of short stories in the last few years.A) wrote B) was written C) has written D) had written这道题为什么不选A而选D啊,in the last few years.不是一般过去时的时间提示词吗