You can, ________ the sky is clear, see as far as the old temple on top of the mountain, but not today.[ ]

A. because  

B. though

C. for  

D. when

增值税扣税凭证包括（）。

A.农产品销售发票

B.农产品收购发票

C.增值税专用发票

D.货物运输业专用发票