The Education Department says that school safety has set off alarm bells with frequent reports of serious accidents ________ students got injured or killed.
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A
after which
B
in which
C
by which
D
for which
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Last summer we visited the West Lake, ______Hangzhou is famous in the world.
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for which
B
for that
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in which
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what
The room ______ door is painted green is our headmaster’s office.
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A
whose
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its
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which
D
of which
The young boy got himself into a dangerous situation_____he might lose control over his sports car.
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that
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which
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After _______ seemed half an hour, the teacher gave us the correct answer.
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A
what
B
that
C
which
D
it