Copernicus’s theory is now the basis ______ all our ideas of the universe are built.
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to which
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on which
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for which
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by which
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Great changes have taken place in that school. It’s no longer ___ it was 20 years ago, ____ it was so poor.
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what, when
B
that, which
C
what, which
D
which, that
Shy people often avoid situations _____would force them into close contact with other people．
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where
B
which
C
when
D
what
- Was it because of his laziness_______ he didn't do the experiment successfully?- No, it was because of his carelessness.
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that
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while
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for
D
as
Whenever I met her, was fairly often, she greeted me with a sweet smile.
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who
B
that
C
when
D
which
I refuse to accept the blame for something _________ was someone else’s fault.
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A
who
B
that
C
as
D
what