racing drivers have reached speeds over 600 miles an hour.

racing drivers have reached speeds over 600 miles an hour. reached speeds over 600miles an hour.speed为什么要加复数? 新概念中的题in a long drop,they reach speeds of 60 miles an hour a Although Campbell reached a speed of over 304 miles per hour 60 miles an hour the winning car reached a speed of fourty miles an hour-much the winning car reached a speed of forty miles an hour much The winning car reached a speed of forty miles an hour--much It reached a speed of forty miles an hour.It _____ forty mil It reached a speed of forty miles an hour. It _____ forty mi The winning car reached a speed of forty miles an hour - muc You must have been driving at seven miles an hour