问题
选择题
“Did you hear someone knocking at the door?”
“Yes, I did. I heard him______three times.” [ ]
A. knocking
B. knocked
C. being knocking
D. knock
答案
答案：D
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“Did you hear someone knocking at the door?”
“Yes, I did. I heard him______three times.” [ ]
A. knocking
B. knocked
C. being knocking
D. knock
答案：D