[ Perfect Tenses ]
The journalist ____________the conspiracy theory for months before publishing the piece last week.
A. had investigated
B. had been investigating
C. was investigating

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Phrasal Verb and Modal › View. Hey kids! Do you think Abigail and Ethan should ever play with matches? What do you think they must or must not do?
A. must
B. must not
Second Conditional › View
If I were 20,
A. I will travel the world.
B. I would travel the world.