I think she is sure to come if she ______free.A will be B is能解释选择答案的原因吗

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I think she is sure to come if she ______free.A will be B is能解释选择答案的原因吗
I think she is sure to come if she ______free.A will be B is能解释选择答案的原因吗

I think she is sure to come if she ______free.A will be B is能解释选择答案的原因吗
B is
楼主 选B be sure to come确定回来 已经表示将来了 后边用现在时就可以了 相当于
I think she will surely come if she is free

B

选B is 可用主将从现解释 前面be to 可以看做将来时态

b.think引导的从句是一个if引导的条件句,在she is sure to come.......这个句子中,主句用将来时,从句应该用一般现在时