单项选择题

It is because Chinese is very useful ______.

A. that we study it very hard
B. why we study it hard
C. what we study it hard
D. which we study it hard
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Up to now, he has taken part in five English contests, in ______ he was the winner.
A. every one
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单项选择题
They have just bought a new villa ______ sitting room, you can see a huge garden.
A. from the
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C. from whose
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