题干
There're so many kinds of tape-recorders on sale that I can't make up my mind _______ to buy.
A：what
B：which
C：how
D：where
答案(点此获取答案解析）
B
There're so many kinds of tape-recorders on sale that I can't make up my mind _______ to buy.
A：what
B：which
C：how
D：where
