问题
选择题
Smoking, _______ is a bad habit, is, however, popular.
A．that
B．which
C．it
D．though
答案
答案：B
which is a bad habit 非限制性定语从句.
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Smoking, _______ is a bad habit, is, however, popular.
A．that
B．which
C．it
D．though
答案：B
which is a bad habit 非限制性定语从句.