(2013·四川，7)He is so busy.He cannot afford enough time with his son________he wants to.
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A
even if
B
as if
C
because
D
before
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He has three children, are doctors.
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A
and two of whom
B
two of them
C
two of whom
D
two of which
Safety in school has been of great concern (关注) because of recent reports about accidents _____ students got injured or killed at school.
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A
for which
B
when
C
which
D
in which
Mr Green drove slowly on the way home until he reached the high way, ______the speed limit was 60 miles per hour.
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A
because
B
which
C
where
D
that
Little Tommy was reluctant to tell the schoolmaster _____ he had done the day before.
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A
that
B
how
C
where
D
what