the old house is dirty.They________it for years. A.didn't clean B.hasn't cleaned C.don't cleanedD haven't cleaned Form ten to twelve yesterday,I ______at the park.A was running B were running C ran D run
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the old house is dirty.They________it for years. A.didn't clean B.hasn't cleaned C.don't cleanedD haven't cleaned Form ten to twelve yesterday,I ______at the park.A was running B were running C ran D run
the old house is dirty.They________it for years. A.didn't clean B.hasn't cleaned C.don't cleaned
D haven't cleaned
Form ten to twelve yesterday,I ______at the park.
A was running B were running C ran D run
the old house is dirty.They________it for years. A.didn't clean B.hasn't cleaned C.don't cleanedD haven't cleaned Form ten to twelve yesterday,I ______at the park.A was running B were running C ran D run
D 强调对现在的影响(is dirty 很脏 ) 用【现在完成时】
B,表示在Form ten to twelve yesterday这个过去时段正在做的事,用【过去进行时】
D
D
B am的过去式是was
1.D (haven't done表示一直持续到现在的状态。)
2.A (过去进行时,表示当时一个时间段一直持续的动作和状态。)