—Hi．Tommy, got a minute?

—________ , what's on your mind?

A．Sure, come in                                     B．No, I'm sorry

C．Of course not, help yourself               D．Yes, it's one clock sharp

—Hi, Tommy, got a minute?

—           ,what’s on your mind?

A．Sure, come in  B．No, I’m sorry

C．Of course not , help yourself   D．Yes, it’s one clock sharp

—Hi, Tommy, got a minute?

—           ,what’s on your mind?

A．Sure, come in                                             B．No, I’m sorry

C．Of course not , help yourself                       D．Yes, it’s one clock sharp

—Hi. Tommy，got a minute?

—________, what’s on your mind?

A．Sure, come in                                            B．No，I’m sorry

C．Of course not, help yourself                D．Yes，it’s one clock sharp