If I hadn’t stood under the ladder to catch you when you fell, you now.
A. wouldn’t be smiling
B. couldn’t have smiled
C. won’t smile
D. didn’t smile
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(答案→)A. wouldn’t be smiling
B. couldn’t have smiled
C. won’t smile
D. didn’t smile
解析：考查混合虚拟。If I hadn’t stood under the ladder to catch you when you fell和过去事实相反，用过去完成时；you now.和现在事实相反，用wouldn’t+现在时态。选A。