[ Modals ]
She could _____ at school when we called her. That’d explain why she didn’t pick up.
A. study
B. have been studying
C. have studied
D. be studying
Select your answer:

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Grammar › ViewA fire in the ……… building could be a problem for firefighters.
A. ninety-story-tall
B. ninety-tall-story
C. ninety-stories-tall
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Grammar › View
Over the summer, Ben developed a taste for tofu products.
“Over the summer,” is a _______
A. phrase
B. dependent clause
C. independent clause
D. mistake
