2. 外语
  3. "Do you hear someone knocking at the door?" "Yes, I did. I heard him ______ three times."

"Do you hear someone knocking at the door?" "Yes, I did. I heard him ______ three times."

admin2009-12-10  25
问题 "Do you hear someone knocking at the door?"    "Yes, I did. I heard him ______ three times."
选项 A、knocking
B、knocked
C、being knocking
D、knock
答案D
解析
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