问题
选择题
Schools in the south tend to be better equipped, _____ those in the north are relatively poor.[ ]
A. while
B. since
C. when
D. as
答案
答案：A
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Schools in the south tend to be better equipped, _____ those in the north are relatively poor.[ ]
A. while
B. since
C. when
D. as
答案：A