If I had not stood under the ladder to catch you when you fell, you ( ) now. A.couldn.t have smiled B.wouldn.t be smiling C.didn.t smile D.won.t smile

If I had not stood under the ladder to catch you when you fell, you ( ) now.

A.couldn.t have smiled
B.wouldn.t be smiling
C.didn.t smile
D.won.t smile

出自：当代英语语法概论

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