问题
选择题
There are many CD-ROMs in the bookshop. I don't know _______ to buy. [ ]
A. what
B. which
C. when
D. how
答案
答案：B
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There are many CD-ROMs in the bookshop. I don't know _______ to buy. [ ]
A. what
B. which
C. when
D. how
答案：B