问题
选择题
I ________ him in time, otherwise he would have fallen off the bike.
A．had supported
B．supported
C．have supported
D．support
答案
答案：B
B 考察虚拟语气。句义：我及时扶住了他，要不然他就会从自行车上摔下来。根据题干中的otherwise he would have fallen off the bike可数是对过去事实进行虚拟，所以使用一般过去时。故B正确。