[ 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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Grammar › ViewI always enjoy _______ to my grandfather. He always tells me great stories.
A. to talk
B. to talking
C. talking
D. talk
Grammar › View
Please open the door ____________ the windows.
A. with
B. and
C. but
D. or