WHEN ________ IS NOT KNOWN.A. WAS THE WHEEL INVENTED B. THE INVENTION...

Tiếng Anh Đề thi thử tốt nghiệp THPT Môn tiếng anh mã đề 7361 năm 2017

78: When ________ is not known.A. was the wheel invented B. the invention of the wheelC. the wheel was invented D. it was invented the wheel