- I letters since then, but I haven't finished them yet.[ ]A. have writtenB. have been writingC. wroteD. has been writing
- I've been _____ money to buy computer.A. looked forB. savingC. makeD. spending
- I ________ for you for two hours at the gate of school.A. waitB. have been waitingC. am waitingD. have been waited
- 用所给单词的适当形式填空。1. Tom______(swim) for two hours in the river.2. When______you______(buy) the new computer?...
- He has been English for six years.A. learnedB. learnC. learnsD. learning
- 看看你的应变能力,用所给单词的适当形式填空。1.I built one of my rockets _______(I)2.I ______(lose)one of my books yes...