In all 6 000 companies are__________ in producing the parts that are needed for these airc

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In all,6 000 companies are__________ in producing the parts that are needed for these aircraft.

A.concemed

B.recommended

C.involved

D.offended

请帮忙给出正确答案和分析,谢谢!

热搜:关于氨基酸代谢错误的论述是_________。