Tom with his friends ______ volleyball since three o’clock.A．has been playing B．
题型：不详难度：来源：
Tom with his friends ______ volleyball since three o’clock.| A．has been playing | B．is playing | C．have been playing | D．have played |
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答案
| A |
解析
| 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。 |
举一反三
All that can be said ______.| A．has been said | B．have been said | C．is said | D．are to be said |
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