1. When we arrived at the park ,Lily__(leave).
2.I ___(finish) the exercise in few hours.
3.Their luggage ___(check)as they entered the building.
參考答案:1,had left
leave发生在arrived(过去)的过去
2,will finish
3,was being checked
在他们进入时正在被检查,as为动作同步的标志
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1. When we arrived at the park ,Lily__(leave).
2.I ___(finish) the exercise in few hours.
3.Their luggage ___(check)as they entered the building.
參考答案:1,had left
leave发生在arrived(过去)的过去
2,will finish
3,was being checked
在他们进入时正在被检查,as为动作同步的标志