They ___________ for two hours
A．is workingB．workedC．have been workingD．had worked
C
考查時態(tài)�，F(xiàn)在完成進行時態(tài)表示的是從過去的動作開始一直持續(xù)到現(xiàn)在還要持續(xù)下去，故選C，句意：他一直工作了兩個小時了。根據(jù)語境可知還要工作下去。
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