As we all know the H1N1 Flu is so serious, students can’t go into the school _______ they take the temperature and get sure they don’t have a fever.
#55588
A
till
B
after
C
when
D
until
推荐题目
Someone called me up in the middle of the night, but he hung up ______ I could answer the phone.
#57250
A
if
B
since
C
until
D
before
－_____do you tell your mother about your English result?－By using my mobile phone.
#56348
A
What
B
How
C
Why
D
Where
David didn’t give up ______ he had failed in the experiment four times.
#58224
A
if
B
while
C
though
D
since