问题描述：
一道英语选择题.求教
come and join us,jenny.
I am sorry,but i am really busy now ,if I -----time ,I would certainly go.
A will have B have had C had D have
come and join us,jenny.
I am sorry,but i am really busy now ,if I -----time ,I would certainly go.
A will have B have had C had D have
问题解答：
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