问题
单项选择题
Singing these songs, I could not help（）the good old days.
A.thinking over
B.thinking out
C.thinking of
D.thinking up
答案
参考答案：C
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Singing these songs, I could not help（）the good old days.
A.thinking over
B.thinking out
C.thinking of
D.thinking up
参考答案：C