He is riding____ low speed on the road A.at B.in C.on D.to

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He is riding____ low speed on the road A.at B.in C.on D.to
He is riding____ low speed on the road A.at B.in C.on D.to

He is riding____ low speed on the road A.at B.in C.on D.to
A
固定短语:at ...speed 以……的速度
句意是:他正在马路上慢速地骑车.

A. at a +adj speed 以.....的速度