I DIDN’T KNOW ... THAT MACHINE.A. TO OPERATE B. OPERATING C. HOW...

Tiếng Anh 1000-cau-trac-nghiem-tieng-Anh-on-thi-thpt-quoc-gia-2018

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772. I didn’t know ... that machine.

A. to operate B. operating C. how to operate D. how operating