2019年mpa考试英语真题——连词425

{01}I have heard these sons and daughters say they never fully appreciated their parents _____ it was too late to tell them.
A.as
B.that
C.until
D.when
解析：
本题选C。

{02}This year is very special, _____ Chinese New Year"s Day falls on Valentine"s Day.
A.once
B.while
C.if
D.for
解析：
本题选D。