单项选择题

______ pollution control measures tend to be money consuming, many industries hesitate to adopt them.

A. Although
B. However
C. When
D. Because
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The parents were much kinder to their youngest child than they were to the others, ______,of course, made the others jealous.
A. which
B. that
C. what
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Although there are many predictions about the future, no one knows for sure ______ the world would be like in 50 years.
A. how
B. that
C. which
D. what
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