企业制定学员培训纪律规定，主要是为了严肃培训各环节的纪律，合理、有效地利用（），提高培训质量。
参考答案：培训资源
______ the housing price, several measures have been adopted in the last two years. [ ]
A. Lowering
B. Having lowered
C. To lower
D. To have lowered
