He is riding____ low speed on the road A.at B.in C.on D.to
问题描述:
He is riding____ low speed on the road A.at B.in C.on D.to
答
A. at a +adj speed 以.....的速度
答
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.