______ regular exercise is very important, it is never a good idea to exercise too close to bedtime..
#31305
A
If
B
As
C
Unless
D
Although
推荐题目
—Have you finished the book?—No，I’ve read up to____ the children discover the secret cave.
#30631
A
which
B
what
C
that
D
where
___ most of the earth’s surface is covered by water, fresh water is very rare and precious.
#80429
A
As
B
Once
C
If
D
Although
．A person ______ e-mail account is full won’t be able to send or receive any e-mails.
#34788
A
who
B
whom
C
whose
D
whoever