There is a new problem involved in the popularity of private cars __________ road conditions require __________.
#78215
A
that ... improving
B
which...to be improved
C
where ...improving
D
when...improving
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Mark Twin once said: “ The dictionary is the only place ______ success comes before work.”
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Miss White, smile is broad and warm, has a kind of beauty no matter what she wears.
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whom
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who
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