问题补充：
Alice to see his aunt if she free tomorrow.
A. will come; will be
B. come ; is
C. will come ;is
D. comes ;will be
答案：
A. will come; will be
B. come ; is
(答案→)C. will come ;is
D. comes ;will be
解析：根据语境可知此句的含义是如果Alice明天有空，她就去看他的姑姑。考查的是if引导的条件状语从句，主句要用将来时，从句要用一般现在时，故选C。
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