[ Grammar ]
An air-conditioning system _______ a refrigerated gas like Freon to cool the air
A. Using
B. Use
C. Uses
D. Used
Select your answer:
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Present Perfect Tense › ViewDuring this year my old friend Robert ________ played in more than twenty soccer games.
A. Ever
B. Has
C. Never
D. Have
Grammar › View
Identify the preposition in the following sentence.
The cat is under the table.
A. Under
B. Cat
C. Table
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