It was in the lab ______ was taken charge of by Professor Harris _______ they did the experiment.
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A
which, that
B
that, where
C
where, that
D
which, where
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 I just wonder          that makes him so excited.
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A
why it does
B
what he does
C
how it is
D
what it is
It was in the office         my sister works         I met the new manager.
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A
that; that
B
where; where
C
that; where
D
where; that
 The police were seeking more information to find out ________ the rich merchant.
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A
who was it that killed
B
who it was that killed
C
it was who killed
D
who was it killed