________he visited, he wasted no time hearing farmers' voices at home and in the fields.
#30174
A
Each time
B
In case
C
Even if
D
In time
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He knew that cholera would never be controlled _____ its cause was found.
#32471
A
till
B
still
C
until
D
kill
Recently my father bought an ancient Chinese vase, _____ was very reasonable.
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A
which price
B
the price of which
C
its price
D
the price of whose
The researchers found clear and convincing evidence ________ happiness is the key when it comes to better health and longer lives.
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A
where
B
whether
C
how
D
that
The doctors said it would be months _____ Yao Ming was fit enough for regular training.
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A
that
B
when
C
since
D
before