[ Vocabulary ]
He started to ______ if the story was true.
A. solve
B. doubt
C. realize

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Grammar › ViewWhat is ” a part of sentence with subject and verb”?
A. a verb
B. a gerund
C. a clause
D. a phrase
Past Continuous Tense › View
She was walking down the street when she…
A. Tripped
B. She was tripping
