There was a time ________ this kind of skirt was very popular.
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A
that
B
when
C
with which
D
about which
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The new buyer identified a dozen new sources for the material, ___________ proved to be reliable．
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A
most of them
B
most of which
C
most of whom
D
most of those
The Shopping Festival in China falls on Nov. 11 _______millions of Chinese shoppers go to Tmall.com and Taobao.com.
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A
when
B
that
C
which
D
where
Everyone has periods in their lives ______ everything seems very hard.
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A
when
B
where
C
which
D
that
The media today can draw public attention to situation ________ help is actually needed.
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A
that
B
which
C
what
D
where