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?

问题描述:

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 heading
C.have been heading D.had headed
答案选C,我想问这句话是什么意思?