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
You can’t borrow books from the school library ______ you get your student card.
#80553
A
before
B
if
C
while
D
as
Father was late for work the traffic jam, and ,the boss blamed him for it.
#31801
A
as a result;as a result of
B
as a result of; as a result
C
as a result of;in other words
D
as a result; in other words
Relax yourself every day,________ you'll be too tired to get good grades.
#32294
A
and
B
or
C
for
D
but