问题
选择题
This is the first time that I_____ to give a lecture to so large a audience till now.
[ ]
A. am invited
B. have invited
C. have been invited
D. will be invited
答案
答案：C
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This is the first time that I_____ to give a lecture to so large a audience till now.
[ ]
A. am invited
B. have invited
C. have been invited
D. will be invited
答案：C