I was just falling asleep ____ there was a loud knock at the door.
#56801
A
while
B
when
C
until
D
as soon as
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—All the isatis root（板蓝根） is sold out!—People are crazy! experts say there is no use eating isatis root to preventH7N9, some people still don’t believe it.
#56593
A
Although
B
Unless
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As a result
D
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—Does your grandpa often walk the dog after supper? — Yes, _________ bad weather stops him.
#55375
A
unless
B
because
C
though
D
since
Something was wrong with the computer . I had no choice ____ to wait.
#58473
A
except
B
besides
C
beside
D
but