Prices keep going up these days _____ our salaries still remain unchanged.

A. since
B. when
C. as
D. while
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科目：高中英語 來源：0112 期中題 題型：單選題

Prices keep going up these days _____ our salaries still remain unchanged.
[     ]
A. since
B. when
C. as
D. while

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