The teacher came into the classroom _______ by his students. 
#97444
A
following
B
to be following
C
followed
D
having followed.
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When his mother came home, he pretended       sound.
#95833
A
sleeping
B
to sleep
C
to have slept
D
to be sleeping
______ when to leave, I could only stay at home, _____ nothing. 
#93935
A
Knowing not; done
B
Not having known; doing
C
Having not known; done
D
Not knowing; doing