问题描述：
It is the third time I_____to the Palace Museum,and I still think It is marvelous
A have gone
B go
C have been
D had been
这题答案是C,为什么ABD不对.如果把It is the third time改为It was the third time,答案是不是选D
A have gone
B go
C have been
D had been
这题答案是C,为什么ABD不对.如果把It is the third time改为It was the third time,答案是不是选D
问题解答：
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