He kept yawning in class this morning. That is _____ he stayed up late doing his homework last night.
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A
why
B
how
C
because
D
whether
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------Where did you first meet your boyfriend?------It was in the department store ______ he worked.
#79461
A
which
B
that
C
what
D
where
What is concerning us greatly is ____ the workers held up in that area yesterday will be set free.
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A
that
B
what
C
when
D
which
Professor Tang didn't give us a speech today.It was ________ he had a traffic accident on the way to school.
#79354
A
that
B
when
C
why
D
because