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.

admin2007-10-13  17
问题 I was just (falling) (sleep) last night (when) I heard a knock (at) the door.
选项 A、falling
B、sleep
C、when
D、at
答案B
解析 应改为asleep，因为fall是系动词，后面接形容词做表语。
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