世界上最长的运河京杭大运河沟通了( )大水系。

A．黄河、长江两

B．海河、黄河、长江三

C．黄河、淮河、长江、钱塘江四

D．海河、黄河、淮河、长江、钱塘江五

Speaker A: Hello! Professor Freeman's secretary. Can I help you Speaker B:______

A．Hello! Can you find Professor Freeman for me

B．Yes. I hope you can help me. My name is John Smith.

C．Good afternoon. I'd like to make an appointment to see the professor on Thursday, please

D．Thank you. Professor Freeman knows me well.