2. 外语
  3. I (was just) falling (sleep) last night (when) I heard a knock (at) the door.

I (was just) falling (sleep) last night (when) I heard a knock (at) the door.

admin2012-03-26  13
问题 I (was just) falling (sleep) last night (when) I heard a knock (at) the door.
选项 A、was just
B、sleep
C、when
D、at
答案B
解析
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