Mr．Jiang ____ the company to develop the 5G network for years． Now he works as the chief engineer in it．（ ）
A．joinedB．was a member of
C．has joinedD．has been a member of
Mr．Jiang ____ the company to develop the 5G network for years． Now he works as the chief engineer in it．（ ）
A．joinedB．was a member of
C．has joinedD．has been a member of
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