A． moving toward greater informality
B． the influence of American English
C． the influence of science and technology
D． the conflicts between or among nations
A． when
B． that
C．which
D． while
A． Before John stood the policeman
B． Before the policeman stood John
C． Before the policeman John stood
D． Before John the policeman stood
A． Mary play the violin
B． Mary can the violin
C． Mary can play
D． Mary the violin