_________ the development of science,

问题描述:

_________ the development of science,
job positions are becoming fewer and fewer,so many people are worried about ________ they would be out of work.
 A.With; if B.As; whether  C.With; whether D.As; if
选哪个,为什么

C
随着科学的发展,用with
是否可用if也可用whether,但介词后只能用whether