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 It is　　　　he frequently returns home late　　　　makes his parents concerned about him.
#84732
A
because; that
B
that; that
C
不填; that
D
what; that
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It was not until dark         he found that it was the correct way to solve the problem.
#85055
A
that
B
what
C
which
D
when
It was his courage, not his skill,    really struck me most
#85201
A
When
B
Where
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D
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It was Mary      was about to go to bed when the telephone rang.
#84963
A
that
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one
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whom
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—Do you know _______ they got to know each other?—It was last year_______ they both taught Chinese in Scotland.
#84869
A
When it was that, when
B
when it was that, while
C
When it was that, that
D
When it was that, as
Is ________48 hours________ the man- made satellite ________ is made in our country to orbit the planet around?
#85134
A
it; that; where　　　　　　　　　
B
it; when; what
C
it for; that it takes; that
D
it; that it takes; which