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【单选题】
A survey was carried out on the sleep time of students in middle schools, ______ were surprising.
A.
its results
B.
whose result
C.
the results of which
D.
of which results
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参考解析：
刷刷题刷刷变学霸
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A.
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D.
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A.
when; as
B.
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C.
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