[ Grammar ]
Supply and demand have a direct ____ on the prices of commodities.
A. effect
B. affect
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Articles › ViewHave you been to ___ Arctic?
A. the
B. an
C. a
Modals › View
How would you politely request to borrow a book?
A. Can I have this book?
B. May I borrow this book, please?
C. I ought to use this book?
D. If I could only borrow this book for a short period?
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A. could
B. couldn’t
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Grammar › View
Which sentence uses present continuous?.
A. Solving the puzzle took about an hour.
B. We solved the puzzle for an hour.
C. We were trying to solve the puzzle for an hour.
D. The puzzle solved for an hour.