At school,some students are active ________ some are shy,yet they can be good friends with one another.
#30233
A
while
B
although
C
so
D
as
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You can’t borrow books from the school library ______ you get your student card.
#80553
A
before
B
if
C
while
D
as
They had just finished the work _______ there was another one waiting for them.
#31462
A
while
B
when
C
as
D
since
