A total of 548 students fell ill ______ consuming milk and biscuits in schools in Northwest China's Qinghai province on Wednesday, local authorities said.
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A
before
B
when
C
after
D
while
推荐题目
—People often don't appreciate what they have, do they? —No, _____ they lose it.
#30099
A
if
B
after
C
when
D
until
The earth became so violent that it was not clear_________ the shape would last or not.
#32770
A
if
B
how
C
whether
D
why
The two men talked in a low voice, ____nobody heard what they were saying.
#31699
A
so that
B
as if
C
because
D
when