Tom with his friends ______ volleyball since three o’clock.
A．has been playing B．is playingC．have been playing D．have played
A
考查時態(tài)及主謂一致。句意：湯姆和他的兩個朋友自從三點鐘一直在打排球。結(jié)合語境可知本句描述的是過去到現(xiàn)在一直在進行的動作，并且還將持續(xù)下去的動作，故用完成進行時態(tài)。with his friends為伴隨狀語，故主語用單數(shù)形式，選A。
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