— Would you please go hiking with me tomorrow?

— Sorry, I ______. I'll have to meet my cousin in the train station. [ ]

A. can't

B. won't

C. mustn't

D. needn't

暂列金额根据工程复杂程度、设计深度、工程环境条件（包括地质、水文、气候条件等）进行估算，一般可以分部分项工程费的（）为参考。

A.5%～10%

B.5%～15%

C.10%～15%

D.10%～20%