回答下列各题： What is the woman's reply？A.She knows Professor Arnold has come.B.She think

回答下列各题：

What is the woman's reply？

A.She knows Professor Arnold has come.

B.She thinks Professor Arnold has checked in.

C.She is sure that Professor Arnold has arrived.

D.She doesn' t know whether Professor Arnold has arrived.

请帮忙给出正确答案和分析，谢谢！