There is ____ Mr. Smith at the door who wants to speak to you.

A. a some     B. certain     C. some a     D. a certain

---John, there is _____ Mr．Wilson on the phone for you.

   ---I’m in _____bath.

       A．a ; the      B．the ; a       C．a ; 不填         D．the ; 不填

There is ____ Mr. Smith at the door who wants to speak to you.?

  A. a some         B. certain        C. some a          D. a certain?

— John, there is ______ Mr Wilson on the phone for you.

— I’m in ______ bath.

A. a; the B. the; a　　C. a; 不填 D. the; 不填

— John, there is ______ Mr Wilson on the phone for you.

— I’m in ______ bath.

A. a; the B. the; a　　C. a; 不填 D. the; 不填