单项选择题

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

A．falling
B．sleep
C．when
D．at
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单项选择题
She was (angry), went (out), and (slamming) the door (behind) her.
A．angry
B．out
C．slamming
D．behind
单项选择题
The boy denied (to have seen) (anyone) in the building when (being questioned) by the teacher (shortly after) the incident.
A．to have seen
B．anyone
C．being questioned
D．shortly after
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