问题描述：
20.There isn’t any difference between the two.I really don’t know ( ).(本题分数：2 分.) A、 w
20.There isn’t any difference between the two.I really don’t know ( ).(本题分数：2 分.)
A、 which to choose
B、 to choose what
C、 what to choose
D、 to choose which
20.There isn’t any difference between the two.I really don’t know ( ).(本题分数：2 分.)
A、 which to choose
B、 to choose what
C、 what to choose
D、 to choose which
问题解答：
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