The risk from bird flu is generally low to most people _______ the viruses occur mainly among birds and do not usually i

问题描述:

The risk from bird flu is generally low to most people _______ the viruses occur mainly among birds and do not usually infect humans.
A. in which B from which C. to which D. in that
应该选A,还是D, 为什么

in that
因为查字典,in that 是“由于”的意思,哈哈