[ Grammar & Vocabulary ]
. You are explaining a decision you made in the past that led to a positive result. Which sentence is correct?
A. Had I known about the traffic, I would have left earlier.
B. I have left earlier if I knew about the traffic.
C. If I knew about the traffic, I would leave earlier.
D. If I had known about the traffic, I would have left earlier.
Select your answer:

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Who or Whom › ViewInto the dark apartment walked David, (who/whom) we nearly killed with surprise when everyone shouted “Happy Birthday” and jumped from behind the furniture.
A. who
B. whom
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Maria was _________ around all day in the classroom.
A. roaming
B. roam
C. rooming
