单项选择题
By the time he realizes he（）into a trap, it'll be too late for him to do anything about it.
A.walksB.walkedC.has walkedD.had walked
单项选择题 Make sure you've got the passports and tickets and（）before you leave.
单项选择题 We were all surprised that Tom（）have got the highest mark in the maths test．
单项选择题 Mary tries to （）the data in her report from a completely different angle.
