If Henry ______ under the ladder to catch her when she fell she couldnt be smiling like t

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If Henry ______ under the ladder to catch her when she fell, she couldnt be smiling like this now.

A.didn"t stood

B.hadn"t stood

C.doesn"t stood

D.hasn"t stood

请帮忙给出正确答案和分析,谢谢!

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