Most whales must come up for air after several minutes, _______ a few can stay under water for an hour or more.
#33567
A
while
B
or
C
for
D
so
推荐题目
He failed in the exam not only his laziness but also he didn’t listen to the teacher.
#31866
A
because; for
B
because of; because
C
as; for
D
for; since
Some people waste a lot of food ________ others haven’t enough to eat.
#34343
A
however
B
when
C
as
D
while
Mark needs to learn Chinese________his company is opening a branch in Beijing.
#30240
A
unless
B
until
C
although
D
since
_______ you want me to fire you, I suggest you not wear sports clothes in the office next time.
#32866
A
As long as
B
As far as
C
Since
D
Unless
Jerry has promised to keep the secret, so he won't tell anyone ________ asked to.
#30278
A
until
B
now that
C
unless
D
even though