Come and join us,Jimmy!I'm sorry,but I'm really busy now.If I( )time,I would certainly goA will haveB have hadC hadD have选哪个为什么,懂的人回答

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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
选哪个为什么,懂的人回答

C
来和我们一起玩儿吧,吉米!
对不起,但是我现在真的很忙,如果我有空,我肯定去.
说明他现在不可能有空,这只是一种假设,是虚拟语气,动词要用过去时.