当公交车上全是人时. When a bus is full of people. 为什么这里用is不用are
问题描述:
当公交车上全是人时. When a bus is full of people. 为什么这里用is不用are
答
a bus 做主语 是单数所以用is
当公交车上全是人时. When a bus is full of people. 为什么这里用is不用are
a bus 做主语 是单数所以用is