Things will get easier as time _____.A.past B.went by C.goes by D.have passed
选C.
句意：随着时间的流逝,情况会变得更好.
as 引导时间状语,从句用一般时表示将来.
past不是动词.
went by是过去时,在本句中不能用的.
have passed是现在完成时,表示已经过去.