The office staff______ assembled outside the building to mourn the victims in the earthqua

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The office staff______ assembled outside the building to mourn the victims in the earthquake.

A.is being

B.has

C.is

D.have

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_________。