The door ____ with difficulty.
A. is shutting
B. shuts
C. was shut
D. is shut
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You ought to put the meat in the refry, but now _____ sour.
A. it is smelt
B. it is smelling
C. it smells
D. it will smell
The wolf was killeda gun.
A. by
B. on
C. with
D. in
Which sentences cannot be changed into passive sentence?（more than one choice）
A. Bob has a house in the city
B. She dreams a sweet dream.
C. She resembles her mother.
D. He hurt himself when he fell.
请把语法术语“Voice”翻译成汉语: ____。
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