()5.If a computer crashes, you will lose the files you ________ if you don’t save it early enough. A．are working on

　　B．work on C．will work on

　　D．worked on 5．A。结合语境可知道此处应该用现在进行时。

　　()6.I understand it’s not your fault, but the airline________ they would deliver my baggage yesterday. A．promises

　　B．has promised C．promised

　　D．had promised 6．C。从后面的时间状语yesterday可知，描述的是过去发生的事情，应用一般过去时态。

　　()7.—Hi，Susan，where were you at lunch time? I________ a seat for you in the coffee shop. —Oh，sorry to miss you.My political science class ran longer than usual. A．am saving

　　B．was saving C．had saved

　　D．have saved 7．B。根据语境判断，吃饭是过去发生的事情，强调在吃饭的过程中“一直为对方留着位子”，应该用过去进行时。

　　()8.—Do you know our city of Xi’an at all? —No，not at all.You see，this is the first time I________here. A．am

　　B．had been C．was

　　D．have been

　　8．D。It / This is the first / last time(that)sb have / has done为固定句型。

　　()9.I ________ to help you to do homework but I couldn't spare any time.I was writing a composition last night and I'll finish it today. A．wanted B．had wanted C．have wanted D．have been wanting 9．B。第一空：had wanted表“原打算……”。第二空：用过去进行时表过去特定时间里一直持续的动作。

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