He _______ it for two hours, and he's still watching now.
A:has been watched
B:watching
C:has been watching
D:is watching
2016年6月以来,国际外汇市场波动较大,人民币对美元有所贬值,在一定程度上提升了我国对外贸易的竞争力。下列传导路径中,能正确说明人民币贬值提升我国对外贸易竞争力的是( )