Someofmyfriendsareinterestedinscience,butnoneofthem...

问题详情：

     Some of my friends are interested in science, but none of them can tell ____________.

     A. when UFOs appear next time                          B. if horses know the way or not

     C. where was this kind of plant found                  D. how elephants communicate

【回答】

D

知识点：宾语从句

题型：选择题