2019年mpa考试英语真题——介词和介词短语475

{01}They were putting on their clothes and leaving the bank ________a boy fell into the river．
A.while
B.when
C.before
D.after
解析：
本题选B。
{02}Firework ________ the beauty of the festival night．
A.added to
B.added up
C.added up to
D.added
解析：
本题选A。