the old house is dirty.They________it for years. A.didn't clean B.hasn't cleaned C.don't cleanedD haven't cleanedForm ten to twelve yesterday,I ______at the park.A was running B were running C ran D run
问题描述：
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
答
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。）
答
D
B am的过去式是was
答
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】
答
D