2. 外语
  3. ______at the door before you come into the room.

______at the door before you come into the room.

admin2016-09-28  33
问题 ______at the door before you come into the room.
选项 A、Hit
B、Knock
C、Touch
D、Strike
答案B
解析 本题考查固定搭配。knock at the door“敲门”，是固定用法。句意为：你进房间之前请敲门。
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