We pulled him out of the river and tried to revive him, but to n

We pulled him out of the river and tried to revive him, but to no （）.
A、use
B、help
C、trail
D、avail
【正确答案】：D
【题目解析】：to no avail 是固定搭配，意为“无效，不起作用”。因此选D。我们把他从河里拉出来想使他恢复知觉，但没有成功。