-Come and join us,Sam.-Sorry,but I'll really busy now.If I _

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-Come and join us,Sam.-Sorry,but I'll really busy now.If I __time,I___certainly go
A.had ；would
B.have；will
但是我觉得是B.为什么不是B啊?

：-Come and join us,Sam.-Sorry,but I'm really busy now.If I __time,I___certainly go
A.had ；would
B .have；will
答案是A,但是我觉得是B.为什么不是B啊?求高手指点!
答：A是虚拟语气,虚拟条件句.B是真实语气,真实条件句.
译：萨姆,来和我们一起玩吧.
对不起,我现在真的很忙.如果我有时间的话,一定会去的.
析：从前面的I'm really busy now.可知道现在我没有时间.If I had time,就是一种与现在情况相反的假设,用过去时来表示.主句用would+动词原形.

-Come and join us,Sam.-Sorry,but I'll really busy now.If I _ Come and join ua ,Jimmy!I'm sorry ,but i'm busy now,If I ___ 一道英语选择题.求教come and join us,jenny.I am sorry,but i am really I hope you can join us, Sam and Tim./ /I hope you to join us ---Why not come and join us in the game?---___,but I have so I‘m really sorry that I forgot _(borrow) your monney.I'll re Sorry , I am too busy now. If I _____time , I would certainl can you join us in the game?i'm sorry,but Ican't.I have some Sorry.I am busy now.Let us talk next week.Don't you know I a I went to the US,and never come back,sorry. sorry.i am__(相当)busy now Sorry,I'm very busy now.