Up to Tuesday's attack, the worst school shooting in the U. S. was in March 1998 in Jonesboro,______two boys, aged 11 and 13, shot and killed a teacher and four girls.
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A
while
B
where
C
when
D
then
推荐题目
 Is this factory _____ you visited the other day?
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A
the one
B
that
C
where
D
when
The other day, only an old couple came to see my art exhibitions, ______thought highly of them.  
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A
none of whom
B
neither of whom
C
neither of them
D
both of them
If I      you, I      the job.
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A
am; will take
B
was; would take
C
were; would take
D
are; will take