Smoking, _______ is a bad habit, is, however, popular.

A. that       B. which           C. it          D. though

Smoking, _______ is a bad habit, is, however, popular.

A. that      B. which     C. it    D. though

Smoking, _______ is a bad habit, is, however, popular.

A. that B. which C. it D. though [

Smoking, _______ is a bad habit, is, however, popular.

A. that 　　 B. which 　　 C. it 　　 D. though

Smoking, _______ is a bad habit, is, however, popular.

A. that 　 B. which 　　　C. it　　　　 D. though