He waited ________ the volcano became quiet and he was able to return two days later.
#80251
A
when
B
before
C
as
D
until
推荐题目
Some people waste food，________other people haven’t got enough to eat.
#31933
A
when
B
until
C
since
D
while
I should convey my appreciation to my high school teachers, without ____ help I wouldn’t achieve such a big success.
#33344
A
whom
B
them
C
which
D
whose
You have been reading to me __________ James went out.
#31662
A
the moment
B
before
C
when
D
ever since
— I rang you at about nine, but there was no reply.— Oh, that was probably _____I was seeing the doctor.
#31069
A
why
B
when
C
what
D
That
________ the man grew older, he lost interest in everything except gardening.
#80291
A
With
B
Since
C
While
D
As