问题
选择题
I don't know whether you happen ____ that he has been away for two months.[ ]
A. to be heard
B. to be hearing
C. to hear
D. to have heard
答案
答案：D
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I don't know whether you happen ____ that he has been away for two months.[ ]
A. to be heard
B. to be hearing
C. to hear
D. to have heard
答案：D