问题补充：
—Come and join us, Jimmy!
---I’m sorry, but I’m really busy now. If I time, I would certainly go.
A. will have
B. have had
C. had
D. have
答案：
A. will have
B. have had
(答案→)C. had
D. have
解析：句意：——吉米，来加入我们吧！——我很抱歉，现在我真的很忙。如果我有时间，我一定去。在虚拟语气中，表示与现在事实相反时，从句：If+主语+过去时，主句：主语+ should/would+do。故选C。
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