问题
选择题
Tom with his friends ______ volleyball since three o’clock.
A．has been playing
B．is playing
C．have been playing
D．have played
答案
答案：A
考查时态及主谓一致。句意：汤姆和他的两个朋友自从三点钟一直在打排球。结合语境可知本句描述的是过去到现在一直在进行的动作，并且还将持续下去的动作，故用完成进行时态。with his friends为伴随状语，故主语用单数形式，选A。