问题
选择题
There are so many kinds of Mp3 in the shop. We can’t decide ________ .
A．what to buy
B．to buy what
C．which to buy
D．to buy which
答案
答案：C
本题的含义是我们不能决定买那个，疑问词which后加动词不定式to do代替从句，故本题选C。
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