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His children are well-behaved, _____ those of his sister are naughty.

A. as
B. although
C. while
D. when
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科目：高中英語 來源：專項題 題型：單選題

His children are well-behaved, _____ those of his sister are naughty.
[     ]
A. as
B. although
C. while
D. when

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