--what a shame -- yes,i ___his not doing it,but in vain

问题描述:

--what a shame -- yes,i ___his not doing it,but in vain
--what a shame
-- yes,i ___his not doing it,but in vain.
A would suggest B had suggested \
the answer is b,why not use

这个完全代表过去的情况啊……为什么要用过去将来时呢……