The days are gone________you can breathe fresh，unpolluted air or drink clean, unpolluted water in the countryside.
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A
when
B
that
C
where
D
which
推荐题目
She has a gift for creating an atmosphere for her students _______allows them to communicate freely with each other.
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A
which
B
where
C
what
D
who
Now she is considering taking some weight-loss pills, _______ she thinks will help her become slim.
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A
which
B
that
C
what
D
who
It’s reported that over 70 different emoticons are used in text messages， happy：)is the most popular．
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A
to which
B
that
C
of which
D
which