for the timely investment from the general public, our pany would not be developing so fast as it is.
A. Had it not been
B. Were it not
C. Was it not
D. Should it not be
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(答案→)A. Had it not been
B. Were it not
C. Was it not
D. Should it not be
解析：考查省略if的虚拟语气。和过去事实相反，用过去完成时。省略if，进行部分倒装。所以选A。