— Let's go for a walk, shall we?

— It's too late now; ________, it's beginning to rain. [ ]

A. in addition  

B. in a word

C. as a result  

D. in general

蒸汽干燥室在木材干燥过程中为保证木材干燥质量，定期向室内喷洒水分，叫做喷蒸处理。