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