2019年mpa考试英语真题——连词445

{01}The school rules state that no child shall be allowed out of the school during the day, _____ accompanied
by an adult. A.once
B.when
C.if
D.unless
解析：
本题选D。

{02}— How long do you think it will be _____ China sends a manned spaceship to the moon?
— Perhaps two or three years.
A.when
B.until
C.that
D.before
解析：
本题选D。