现在完成时与现在完成进行时比较练习一. Make the best choices.（选择题）1. Im sure Andrew will win the first prize in the final. I think so. He _ for it for months. A. is preparingB. was preparingC. had been preparingD. has been preparing2. By the time he realizes he _ into a trap, itll be too late for him to do anything about it. A. walks B. walked C. has walked D. had walked3. So far this year we _ a fall in house prices by between 5 and 10 percent. A. saw
