题目内容

【题目】— Do you know if they swimming with us tomorrow?— I think they will if they free
A.go, will be
B.will go, are
C.go, are
D.will go, will be.

【答案】B
【解析】根据题干和选项提示可推知句意为：—— 你知道他们明天是否将和我们一起去游泳吗?—— 我想如果他们有空，他们会的。第一个if引导的是宾语从句，根据时间状语，用将来时态；后一个if引导的是条件状语从句，用一般现在时表将来。所以答案是：B

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