The school rules state that no child shall be allowed out of the school during the day, __________ accompanied by an adult.
#32564
A
once
B
when
C
if
D
unless
推荐题目
From space, the earth looks blue. This is about seventy-one percent of its surface is covered by water.
#31194
A
why
B
how
C
because
D
whether
____________ the weather has improved, the game will be held as planned.
#31656
A
While
B
Since
C
If
D
Unless
The Time Traveler stops 30 million years into the future and experiences a future time _____ the sun no longer shines brightly.
#34274
A
where
B
when
C
which
D
and
．China is playing an important role in the world. That’s_______Laura has come to study Chinese.
#34794
A
because
B
why
C
how
D
that
John thought it wouldn’t be long _____ he was ready for his new job.
#31646
A
since
B
when
C
before
D
after