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It was not until dark _____ he found _____ he thought was the correct way to solve the problem．
#68092
A
when; that
B
that; that
C
when; what
D
that; what
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While Helen __________ the guitar, her mother came in.
#41299
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was playing
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_____ interesting the film is, I won’t waste any time on it.
#69304
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#69344
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 He left Europe _____ World war II broke out.
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#71903
A
that　
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which
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