31. If I under the ladder to catch you when you fell, you now.
A. hadn’t stood ; wouldn’t be smiling
B. hadn’t stood , couldn’t have smiled
C. didn’t stand, won’t be smiling
D. didn’t stand, couldn’t be smiling
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(答案→)A. hadn’t stood ; wouldn’t be smiling
B. hadn’t stood , couldn’t have smiled
C. didn’t stand, won’t be smiling
D. didn’t stand, couldn’t be smiling
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