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I DID NOT KNOW ________ THAT MACHINE.A. TO OPERATE...
I DID NOT KNOW ________ THAT MACHINE.A. TO OPERATE B. OPERATING C....
20 DE TRAC NGHIEM TIENG ANH
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5. I did not know ________ that machine.a. to operate b. operating c. how to operate d. how operating
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20 DE TRAC NGHIEM TIENG ANH