(2013·济南二模)It was during the Ming Dynasty ________ the Great Wall was repaired and extended to take on the appearance it has today.
#30404
A
when
B
which
C
what
D
that
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______ you understand it, it’s easy for you to obey it.
#33755
A
As soon as
B
Once
C
Unless
D
The moment
You shouldn’t go out without a coat , it’s rather cold .
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A
unless
B
even though
C
however
D
since
---Did you wait for him long? ---No, I hadn’t waited long _______ he appeared.
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A
unless
B
until
C
before
D
since
We should consider the professor’s advice _______ our school library provide more books on popular science.
#34143
A
that
B
when
C
which
D
where