问题
选择题
______ a little earlier, you could have caught the last bus.
A．If you would arrive
B．If you arrived
C．Should you arrive
D．Had you arrived
答案
D
题目分析：句意：如果你早一些到达，你就可能赶上最后一班车了。从you could have caught the last bus.可知前面是和过去相反的虚拟条件句，If you had arrived a little earlier,这时可以省略if，提前had，所以选D。