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— How long have you been here？ — ______ the end of last month，

A. In    B. By    C. At     D. Since

— How long have you been here？

 — ______ the end of last month，

A. In    B. By    C. At     D. Since

— How long have you been here？ — ______ the end of last month，

A. In　 B. By　 C. At　　 D. Since

 — How long have you been here？ — ______ the end of last month，

A. In    B. By    C. At     D. Since