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托业的语法题请教128.Initial fears about the compatibility of theprog

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托业的语法题请教
128.Initial fears about the compatibility of the
program with personal computers have -------
been resolved and the manufacturers have
begun production.
(A) soon
(B) after
(C) since
(D) often
答案是选c,为什么不是a呢?
这里since = since then从那以后,一般和完成时搭配
soon一般和将来时搭配,指不久以后
比如Initial fears about the compatibility of the
program with personal computers would soon
been resolved.