Mr Smith was having a meeting at that time, otherwise he over to help us.
A. would have e
B. would e
C. had e
D. was going to e
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(答案→)A. would have e
B. would e
C. had e
D. was going to e
解析：考察虚拟语气。本题是一个含蓄条件句额虚拟语气。关键词是otherwise否则，要不然；根据前半句可知是与过去事实相反，故使用情态动词+have done。结合句意可知A正确。句意：在那时史密斯先生正在开会，要不然，他本会过来帮助我们的。