单选题
John, I haven't had a chance to phone Bill. Have you? Liz A．Liz has tried unsuccessfully to phone Bill. B．Liz is asking John to phone Bill. C．Liz has been too busy to phone Bill.
【正确答案】
C
【答案解析】[精析] 本题关键是理解have a clnance的意思，have a chance意为“有机会”，A项中tried unsuccessfully表达了两层意思：1试过；2没有成功，所以也可以排除；C项中的too…to…意为“太……以至于没做……”。故选C。