[ Grammar ]
The robot manufacturer had his customers ___ their outdated robots.
A. exchange
B. exchanged
C. to exchange
D. exchanging
Select your answer:
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Grammar › ViewThe teacher with _______ we studied last year is Mr. Pike.
A. who
B. that
C. whom
D. which
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Choose the correct spelling.
A. He was caching a ball.
B. He was catching a ball.
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