Jack ______ from home for two days now and I am beginning to worry about his safety.[2003

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Jack ______ from home for two days now, and I am beginning to worry about his safety.[2003]

A.has been missing

B.has been missed

C.had been missing

D.was missed

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_________。