问题描述：
He is said--two trips to China in the last two years .
A to be making
B to make
C to have made
D to have been making
请问这道题为什么选C啊?
理论依据是什么啊?
A to be making
B to make
C to have made
D to have been making
请问这道题为什么选C啊?
理论依据是什么啊?
问题解答：
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