A:that; that
B:when, where
C:that; where
D:when; that
“玄奘西游”和“鉴真东渡”备受后人称颂,其最根本原因是( )
——How is it going?——_______. I can't find my English book.
以下几个实验现象,能说明声音产生原因的是( )