Doctor Brown says that _______ what forceful arguments against cigarette harm there are, many people insist on smoking.

       A. though                     B. however          C. no matter                 D. even if

Doctor Brown says that ________ what forceful arguments against cigarette harm there are, many people insist on smoking．

1. A.
   though
2. B.
   however
3. C.
   no matter
4. D.
   even if

Doctor Brown says that       what forceful arguments against cigarette harm there are, many people insist on smoking.

A．though            B．however             C．no matter           D．even if