选 A there would be
Since _there would be _ no buses in the minutes,everybody had to run fast to the bus stop.
因为过几分钟会没有公交车,所以大家都快速跑到公交车站.
主句用的一般过去式 had to
since 引导的从句也要用过去的某个形式 而且从句中有 时间状语 inthe minutes 句子用一般将来的某种形式,所以这空应该用过去将来时,即:would do